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, 在敵人的地盤上對抗

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.
他決定深入虎穴,就老闆的不公平待遇與他當面對質。
Despite the risks, she chose to beard the lion in his den and present her controversial proposal directly to the board.
儘管有風險,她還是選擇深入虎穴,直接向董事會提交她有爭議的提案。