18-letter words containing o, n, a, k
- the back of beyond — a very remote place
- the black mountain — a mountain range in S Wales, in E Carmarthenshire and W Powys. Highest peak: Carmarthen Van, 802 m (2632 ft)
- the dark continent — a term for Africa when it was relatively unexplored
- the northern karoo — a high arid plateau in South Africa, north of the Central Karoo
- the-dark-continent — Africa: so called, especially during the 19th century, because little was known about it.
- thorfinn karlsefni — 980–after 1007, Icelandic navigator, explorer, and leader of early colonizing expedition to Vinland, in North America.
- to lay it on thick — If someone is laying it on thick or is laying it on, they are exaggerating a statement, experience, or emotion in order to try to impress people.
- to lick into shape — If you lick, knock, or whip someone or something into shape, you use whatever methods are necessary to change or improve them so that they are in the condition that you want them to be in.
- to pick and choose — If you pick and choose, you carefully choose only things that you really want and reject the others.
- to speak your mind — If you speak your mind, you say firmly and honestly what you think about a situation, even if this may offend or upset people.
- to take the plunge — If you take the plunge, you decide to do something that you consider difficult or risky.
- transmission brake — A transmission brake is a brake that operates on the transmission system of a vehicle rather than directly on the wheels.
- trickle irrigation — drip irrigation.
- turn one's back on — the rear part of the human body, extending from the neck to the lower end of the spine.
- under lock and key — a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, dial, etc.
- under the jackboot — If a country or group of people is under the jackboot, they are suffering because the government is cruel and undemocratic.
- virginia snakeroot — any of various plants whose roots have been regarded as a remedy for snakebites, as the herb Aristolochia serpentaria (Virginia snakeroot) having a medicinal rhizome and rootlets, and the white-flowered Polygala senega (Seneca snakeroot) having a medicinal root.
- watson-crick model — a widely accepted model for the three-dimensional structure of DNA, featuring a double-helix configuration for the molecule's two hydrogen-bonded complementary polynucleotide strands.
- weak nuclear force — weak interaction
- western meadowlark — any of several American songbirds of the genus Sturnella, of the family Icteridae, especially S. magna (eastern meadowlark) and S. neglecta (western meadowlark) having a brownish and black back and wings and a yellow breast, noted for their clear, tuneful song.
- westinghouse brake — a railroad air brake operated by compressed air.
- wingback formation — single wingback formation.
- work one's ass off — work extremely hard
- zion national park — a park in SW Utah. 148 sq. mi. (383 sq. km).