ichidan verb, transitive verb
finish washing; wash thoroughly; investigate thoroughly
Literally 'wash up' or 'wash completely'; also used figuratively for a thorough investigation that leaves no stone unturned.
皿を全部洗い上げたら、棚にしまってください。
After you finish washing all the dishes, please put them away in the cupboard.
警察は事
The police thoroughly investigated the background of the case.