Definitions:
a sleigh or sledge with a box-like body, typically drawn by a single horse and used for carrying light loads.

a set of three identical tiles; the action of completing such a set in one's hand. also occasionally as interjection: announcing this action to other players.

to take a discarded tile to complete a set of three identical tiles. also with object: to pick up (a discarded tile) to make a set of three.