21-letter words containing t, o, u, r

sun protection factor — SPF.
sunday school teacher — someone who teaches at a Sunday school
supergranulation cell — one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.
surface acoustic wave — an acoustic wave generated on the surface of a piezoelectric substrate: used as a filter in electronic circuits
surface friction drag — the part of the drag on a body moving through a fluid that is dependent on the nature of the surface of the body
surface of projection — the surface upon which an image or a set of points is projected.
surface of revolution — a surface formed by revolving a plane curve about a given line.
surface-to-underwater — (of a missile, message, etc.) traveling from the surface of the earth to a target underwater.
synchronous converter — a synchronous machine for converting alternating current to direct current, or vice versa, in which the armature winding is connected to collector rings and to a commutator.
take one's finger out — stop delaying or procrastinating
take sb/sth seriously — If you take someone or something seriously, you believe that they are important and deserve attention.
tartarian honeysuckle — an Asian honeysuckle, Lonicera tatarica, having fragrant, white to pink flowers.
teleological argument — the argument purporting to prove the existence of God from empirical facts, the premise being that the universe shows evidence of order and hence design
temperature inversion — inversion (def 12).
tenure track position — a position or office that carries with it the opportunity to eventually obtain tenure or the right to permanent employment
tetrabromofluorescein — eosin (def 1).
the (norman) conquest — the conquering of England by the Normans under William the Conqueror in 1066
the apple of your eye — If you say that someone is the apple of your eye, you mean that they are very important to you and you are extremely fond of them.
the built environment — the buildings and all other things constructed by human beings
the household cavalry — a group of British soldiers on horseback who have the job of protecting the king or queen and their family
the jury is still out — it has not yet been decided or agreed on
the moral high ground — If you say that someone has taken the moral high ground, you mean that they consider that their policies and actions are morally superior to the policies and actions of their rivals.
theater of the absurd — theater in which standard or naturalistic conventions of plot, characterization, and thematic structure are ignored or distorted in order to convey the irrational or fictive nature of reality and the essential isolation of humanity in a meaningless world.
theatre of the absurd — drama in which normal conventions and dramatic structure are ignored or modified in order to present life as irrational or meaningless
therapeutic community — a group-based form of therapy for mental disorders, sometimes residential
thermoelectric couple — thermocouple.
third party procedure — impleader.
threatening behaviour — intimidation or intentional behaviour that causes another person to fear injury or harm
throw sb a curve ball — If someone throws you a curve or throws you a curve ball, they surprise you by doing something that you do not expect.
throw someone a curve — a continuously bending line, without angles.
to be hard luck on sb — to be unfortunate or unlucky for someone
to be killed outright — If someone is killed outright, they die immediately, for example in an accident.
to be public property — to be publicly owned
to cross your fingers — If you cross your fingers, you put one finger on top of another and hope for good luck. If you say that someone is keeping their fingers crossed, you mean they are hoping for good luck.
to get your rocks off — to reach orgasm; gain sexual satisfaction
to have money to burn — If you say that someone has money to burn, you mean that they have more money than they need or that they spend their money on things that you think are unnecessary.
to know your own mind — If you know your own mind, you are sure about your opinions, and are not easily influenced by other people.
to lay down your life — If someone lays down their life for another person, they die so that the other person can live.
to let your hair down — If you let your hair down, you relax completely and enjoy yourself.
to mix your metaphors — If you mix your metaphors, you use two conflicting metaphors. People do this accidentally, or sometimes deliberately as a joke.
to pull your socks up — If you tell someone to pull their socks up, you mean that they should start working or studying harder, because they have been lazy or careless.
to put one over on sb — If someone puts one over on you, they make you do or believe something by telling you things that are not true.
to put/set sb to work — If you put someone to work or set them to work, you give them a job or task to do.
to rear its ugly head — If something unpleasant rears its head or rears its ugly head, it becomes visible or noticeable.
to rub shoulders with — If you rub shoulders with famous people, you meet them and talk to them. You can also say that you rub elbows with someone, especially in American English.
to sink without trace — If you say that someone or something sinks without trace or sinks without a trace, you mean that they stop existing or stop being successful very suddenly and completely.
to sow your wild oats — If a young person sows their wild oats, they behave in a rather uncontrolled way, especially by having a lot of sexual relationships.
to stick in your mind — If something sticks in your mind, it remains firmly in your memory.
to stick to your guns — If you stick to your guns, you continue to have your own opinion about something even though other people are trying to tell you that you are wrong.
to take your mind off — If something takes your mind off a problem or unpleasant situation, it helps you to forget about it for a while.

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