be out on a limb指当动物攀上树枝，容易成为射击的目标，也因此演变为表示某人做了招惹麻烦的、有风险的事、冒着遭受失败（或指责）的风险、处于孤立无援的境地。

【例句】
They can see themselves going out on a limb, voting for a very controversial energy bill.
他们可以预见到要是给极具争议性的能源法案投赞成票，可能会陷入孤立。

Maybe I'm going out on a limb, but I think we still have to invest it.
或许这么做有点冒险，但我想我们还是要投资它。