signed up; signing up; signs up
Definition of sign up
: to sign one's name (as to a contract) in order to obtain, do, or join something
sign up for insurance sign up for classes
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Name that Thing: Flower Edition
-
- Name that flower

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share sign up
Time Traveler for sign up
The first known use of sign up was in 1875
See more words from the same year