Signed up and Take on

Take on and signed up are semantically related. in use topic. In some cases you can use "Take on" instead a verb "Signed up", when it comes to topics like gather resources, give money in exchange for work performed.

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

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