godan verb (-ku), transitive verb
detain; keep; lock up; retain; leave for later pickup
Covers holding a person in custody, keeping an object in one's possession, or leaving something (like a letter) to be collected later. The specific meaning depends on context.
警察は容疑者を留置場に留め置いた。
The police detained the suspect in a holding cell.
Please keep the important documents in the safe.
郵便局に荷物を留め置いてもらった。
I had the package held at the post office for pickup.