ensnares — Third-person singular simple present indicative form of ensnare.
least squares — a method of estimating values from a set of observations by minimizing the sum of the squares of the differences between the observations and the values to be found.
there's — in or at that place (opposed to here): She is there now.
upstairs — up the stairs; to or on an upper floor.
where's — in or at what place?: Where is he? Where do you live?
Three-syllable rhymes
charge d'affaires — A chargé d'affaires is a person appointed to act as head of a diplomatic mission in a foreign country while the ambassador is away.
kick upstairs — to strike with the foot or feet: to kick the ball; to kick someone in the shins.
put on airs — a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.
unawares — while not aware or conscious of a thing oneself; unknowingly or inadvertently.
Four-or-more syllable rhymes
musical chairs — Also called going to Jerusalem. a game in which players march to music around two rows of chairs placed back to back, there being one chair less than the number of players, the object being to find a seat when the music stops abruptly. The player failing to do so is removed from the game, together with one chair, at each interval.