loka

In a sentence

• Ég ætla að loka dyrunum.

  I am going to close the door.

  Here, 'loka' means to physically close something, in this case, the doors.

• Verslunin lokar klukkan sex.

  The store closes at six o'clock.

  In this sentence, 'loka' is used to indicate the time when the store ceases its operations.

• Við þurfum að ljúka þessu verkefni fyrir föstudag.

  We need to complete this project before Friday.

  Here 'loka', or a variation 'ljúka', is employed metaphorically to signify finishing or concluding an activity or task.