Calling up and Take on

Take on and calling up are semantically related. in gather resources topic. In some cases you can use "Take on" instead a verb "Calling up", when it comes to topics like sign up for responsibility, sign up for membership.

Take on verb - To enter into contest or conflict with.

Calling up and take on are semantically related. Sometimes you can replace term "Calling up" with "Take on", this phrasal verbs are similar.