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Reference : Phrasal Verbs : L : lock up

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lock up

Meaning: to lock the doors and windows of a building or a car to make it secure

Synonym: secure

For example:

  • lock up sth Don't forget to lock up the office when you leave tonight, Charles.

  • lock sth up My car wouldn't have been stolen if I had locked it up properly.

Quick Quiz:

If you are going out for lunch, make sure you lock up
  1. the key
  2. the office
  3. the security guard

Grammar explanation: separable and non-separable phrasal verbs

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