sign up

To register yourself to join an activity, group, or service.

• I want to sign up for yoga.
• We signed up to plant trees on Saturday.
• Have you signed up for the new service?

How to use it: sign up for something (I signed up for a language course.); sign up to do something (She signed up to help at the shelter.)

Similar words: register, enrol, join

Opposites: withdraw

Common phrases: sign up for something, sign up online

To officially add someone to a group or list of people taking part in an activity.

• I signed my son up for football.
• She signed us up for a cooking class.
• Can you sign me up to help tomorrow?

How to use it: sign someone up for something (We signed our daughter up for swimming lessons.); sign someone up to do something (I signed him up to help at the event.)

Similar words: register, enrol

Common phrases: sign up someone, sign up your child

To add your name, or another person's name, to a list for an activity.

• I signed up for art classes.
• We signed our children up for the summer camp.
• Can I sign up for the trip today?

How to use it: sign up for something (We signed up for the school trip.); sign someone up for something (She signed her brother up for tennis lessons.)

Similar words: register, enrol

Common phrases: sign up for something, sign up someone