"easy winner" (especially in politics), 1939, from earlier sense "horse that wins a race by pre-arrangement" (1928); the verb phrase shoo in in this sense is from 1908; from shoo (v.) + in (adv.).
权威例句
1. Shoo, bird, shoo.
嘘!小鸟,嘘!
2. You'd better shoo him away.
你最好把他赶走。
3. He broke off a twig from a willow tree and used it to shoo the flies away.
他折了一根柳树枝来驱赶苍蝇.
4. Shoo those birds away, they're eating my garden seeds!