accusative singular of ręka

(idiomatic) you scratch my back and I'll scratch yours

(idiomatic) hand in hand (holding hands) / (idiomatic) hand in hand, hand in glove (in close cooperation or correlation)

(idiomatic) at one's own risk, on one's own

(intransitive, informal, idiomatic, chiefly in the negative) to bet one's life, to bet the farm, to be absolutely sure about something

(intransitive, idiomatic) to keep one's finger on the pulse