vi.翘起拇指请求搭乘(过路汽车),示意请求搭便车(thumb的过去式与过去分词形式);
例句:
He couldn't afford the fare; he thumbed his way all over Europe.
他付不起车费, 于是他搭便车走遍欧洲.
The books were badly thumbed.
那些书因被翻阅过多而弄得很脏.
He thumbed his way to Boston.
他搭乘别人顺路的车去波士顿.