vt.-pp-1. （常与against, up连用）2. 支持；支撑The mailman propped his bicycle up against the wall and put the mail into the mailbox.邮电员把自行车靠在墙上把邮件放到信箱里。
3. 把…靠着；使保持在某一位置上He propped his bicycle against the fence.他把自行车靠着篱笆放好。
Prop the gate open with something.用什么东西支着大门让它开着吧。