chock
n
block or wedge used to prevent a wheel, barrel, door, etc, from moving (用以防止轮子、 桶、 门等移动的)垫块. chock, v [Tn]
wedge (sth) with a chock or chocks 用垫块塞住(某物).
🗣️ 情景例句
Yes. When you get on the transfer bus, just show the bus driver this ticket stub.