take sth up
phrasal verb with take verb [ T ] uk/teɪk/ ustook | taken
to fill an amount of space or time:
Getting his business started has taken up all his time.
to start doing a new job or activity:
She takes up her new post on December 1.
to accept something:
To take up this offer, you must apply in writing by end March 2012.
take sb up on sth I'm happy to take him up on his challenge.
to discuss or deal with something in a formal way:
take sth up with sb If you have a problem, you should take it up with the manager.
I took the matter up with the bank.