beard the lion in his den

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