beard the lion in his den
US /bɪrd ðə ˈlaɪən ɪn hɪz dɛn/
UK /bɪrd ðə ˈlaɪən ɪn hɪz dɛn/

1.
深入虎穴, 在敌人的地盘上对抗
to confront an adversary on his or her own ground
:
•
He decided to beard the lion in his den and confront his boss about the unfair treatment.
他决定深入虎穴,就老板的不公平待遇与他当面对质。
•
Despite the risks, she chose to beard the lion in his den and present her controversial proposal directly to the board.
尽管有风险,她还是选择深入虎穴,直接向董事会提交她有争议的提案。