A small variety of rock cress, Arabis petraea, growing in central and northern Europe.

Alternative form of the hand that rocks the cradle rules the world

(idiomatic) In a difficult and inescapable position. / (idiomatic) Having the choice between two unpleasant or distasteful options; in a predicament or quandary.

Petrogale lateralis, a rock wallaby.

Alternative form of rock someone's socks

(former name) common rock thrush

plural of rufous-tailed rock thrush

(simile) Extremely rare or scarce.

(US, of raining, pissing, etc) Heavily, copiously, with a great deluge.

(slang, idiomatic) To enjoy oneself immensely, to party.