To ask him for help was like asking a tiger for its skin.

向他求助无异于与虎谋皮。

《新英汉大辞典》

She'll fight like a tiger to protect her children.

她为了保护孩子，可以凶得像只老虎。

《牛津词典》

She fought like a tiger to be able to keep her children.

她勇猛搏斗，以便能保住她的孩子。

《牛津词典》

Or,what better way is there to sell gasoline than to say that using it is like putting a tiger in your tank.

VOA: special.2009.11.08

This is the largest single group allowed to go home since a military campaign to defeat the Tamil Tiger rebels ended this May.

VOA: standard.2009.10.23

The handlers note where the scat is found and take a sample for analysis to determine if it is from a tiger and to check the animal's health.

VOA: standard.2010.02.22

Comparing Gaikai to Steam is like comparing a Lion to a Tiger, in that they are a similar species.

FORBES: Sony To Acquire Cloud Gaming Startup Gaikai For $380 Million

Its willingness to diminish the U.S. role to more-or-less that of any other nation, while insisting on continuing to pick up more than a fifth of the organization's tab has reduced America not just to a paper tiger but a patsy, to boot.

CENTERFORSECURITYPOLICY: Help Wanted: A national security president

Chua refers to herself as a Tiger because according to the Chinese zodiac she was born in the Year of the Tiger.

NEWYORKER: America��s Top Parent