Cases of word usage

1) (also called 'a play on words') a humorous use of words which sound the same or of two meanings of the same word, e.g. 'The soldier laid down his arms' (pun)

2) (one of) a series of horizontal or sloping bars or rods of a fence etc; a continuous line of such bars, laid on the ground for trains; to criticize a person angrily (rail)

3) an impression of something, e.g. a coin, by rubbing with wax etc on paper laid over it (rubbing)

4) material (felt, rubber etc) (to be) laid under a carpet; of underline (underlay)