work like a tiger

　　生龙活虎地工作

　　three cheers and a tiger

　　三声欢呼一声吼

　　How can you catch tiger cubs without entering the tiger's lair?

　　不入虎穴， 焉得虎子?

　　buck the tiger 玩纸牌(特指与赌棍玩牌)

　　tiger sweat 威士忌酒

　　have a tiger by the tail/ He who rides a tiger is afraid to dismount.骑虎难下

　　paper tiger 纸老虎

　　to brag and bully by assuming other people’s authority 狐假虎威

　　a strategic fortress as if guarded by a tiger and a dragon 虎踞龙盘

　　a narrow escape 虎口余生

　　a nation of invaders 虎狼之国

　　to be passionate about something at the beginning but soon lose theirinterest 虎头蛇尾

　　Sitting on a hill watching tigersfight 坐山观虎斗 (It means someone takes a sidein a fight until one partyoverwhelms their enemy. )

　　A goat in tiger's skin 羊质虎皮 (It means someone who appears strong on theoutside but is timid on the inside。)

　　Three people make a tiger. 三人成虎(The idiom suggests that gossip can be asferocious as a tiger。)

　　A new-born calf has no fear of the tiger. 初生牛犊不怕虎。

　　drive a tiger out from the front door while a wolf comes in the back前门拒虎，后门进狼。

　　like a tiger with wings 如虎添翼(It means someone's might is doubled。)

　　to lure the tiger form the mountain 调虎离山