(chiefly UK, sports) To become accustomed to the playing conditions, and thus bring one's hand-eye coordination to a reasonable level. / (chiefly UK) To develop a perceptual skill, especially visual.

A covert operation typically involving activities that are highly clandestine and outside of standard military protocol.

Solely for the sake of entertainment.

A terminal research degree and one of the highest doctorates awarded by a university.

(idiomatic) To behave in a way that is likely to have future negative effects on oneself, including (but not limited to) death.

plural of Doctor of Philosophy

(uncountable) The selling of something to a consumer on condition that the latter may return it. / (countable) A sale under this mechanism.

(chiefly UK) To keep in practice.

plural of fish out of water

Synonym of have one's way with (“have sexual intercourse with”)