out on a limb
置身险地，面临孤立的困境
口语·表达冒险或孤立
英文释义
to be in a risky or vulnerable position
例句
I went out on a limb to defend him, but he didn't even say thanks.
典故来源
源自爬树时爬到细枝上，容易折断，比喻冒险或孤立无援的处境。