stick it out = to continue to the end of a difficult or unpleasant situation坚持到底；忍受下去，挺住。
补充stick out 探出，露出，凸出；显眼，突出。

【例句】
I know things are difficult right now, but if we just stick it out, I'm sure everything will be OK in the end.
我知道现在情况很艰难，但只要我们能坚持下去，我敢肯定最后一切都会好的。

There was a handkerchief sticking out of his jacket pocket.
他的外套口袋露出了手帕的一角。