洗过

washed

→ 洗
phrase Rare #28,870
washed 过 indicates that the washing happened before or has already been done; the English wording depends on context.
CH: 这件衬衫洗过了。
EN: This shirt has been washed.

刚洗过它们

I just washed them.

— 东京物语 (1953)

擦下脚,地板才洗过

Wipe your feet—the floor was just mopped.

— 镜子 (1975)

这大概是因为它们已经转过三四手,又洗过太多次。

That’s probably because they’ve changed hands three or four times and been washed too many times.

根本就没有洗过嘛!

It hasn't been washed at all!

— 千与千寻 (2001)