We just came in to pick up something that might have been set aside?我们来找某样被遗失的东西

pick up:捡起, 收集

It's against the rule to pick up the ball.

捡球是犯规的。

I'll call by and pick up my tools.

我会顺便过来取我的工具。

set aside:留出

He set aside a little money each week.

他每周都留出一些钱备用。

I set aside my overcoat and took out my summer clothes.

我把大衣放起来，取出了夏天的衣服。

Well, you see, a friend of ours dropped something off那个，我们的一个朋友放了些东西

drop off:把…留下 ；掉落

The humper of my car seems to drop off.

我车的保险杆看上去好像要掉下来似的。

I'm never taking it off.打死我也不摘下来

take off:脱掉

However hot it is, he will not take off his coat.

无论多热,他也不会脱掉外衣。

The doctor gestured me to take off my coat.

医生做手势要我脱去外套。