lock up phrasal verb ( see also ↑ lock )
1 . to make a building safe by locking the doors, especially at night:
I’ll leave you to lock up.
lock something ↔ up
Don’t forget to lock up the warehouse.
2 . lock something ↔ up to put something in a safe place and lock the door, lid etc SYN lock away
3 . lock somebody ↔ up to put someone in prison SYN lock away :
Rapists should be locked up.
4 . be locked up (in something) if your money is locked up, you have put it into a business, ↑ investment etc and cannot easily move it or use it