1.to make a signal to a driver with your thumb when you want them to stop and take you somewhere
1.If we miss the last train we can always thumb a lift home.
如果我们赶不上末班火车,我们总可搭便车回家
2.The student gave me a lift. ask for a lift Thumb a lift
向过路车辆竖起拇指表示要求免费搭车