lock something up

Từ điển Oxford Advanced Learner 8th

▪ I. ˌlock sthˈup/aˈway derived
1. to put sth in a safe place that can be locked
2. to put money into an investment that you cannot easily turn into cash
•Their capital is all locked up in property.
Main entry: ↑lock_derived
 
▪ II. ˌlock ˈup | ˌlock sthˈup derived
to make a building safe by locking the doors and windows
•Don't forget to lock up at night.
•He locked up the shop and went home.
Main entry: ↑lock_derived