sign up

verb

signed up; signing up; signs up

intransitive verb

: 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

sign-up

ˈsī-ˌnəp 

noun or adjective

Synonyms of sign up

• join
• enter
• sign on (for)
• enlist (in)
• rejoin
• enroll (in)

Examples of sign up in a Sentence

they both signed up for a Spanish class

Recent Examples on the Web

In the near-future, a desperate father signs up for a deadly game show. — L.m. Chilton, PEOPLE, 26 Sep. 2026

Merchants sign up, fraud slips through anyway, and the vendor walks away clean. — Wayne Hamilton, Forbes.com, 25 Sep. 2026

Regardless of the winner of the match, the real winner is any new user signing up for bet365. — Outkick, FOXNews.com, 19 Sep. 2026

More than 11,000 athletes are signed up from 45 countries and regions in Asia. — ABC News, 9 Sep. 2026

Word History

First Known Use

1875, in the meaning defined above

Rhymes for sign up

• backup
• blowup
• breakup
• buildup
• checkup
• cleanup
• holdup
• hookup
• lineup
• lockup
• makeup
• markup

Kids Definition

sign up

verb

(ˈ)sī-ˈnəp

: to sign one's name in order to get, do, or take something

signed up for Spanish

sign-up noun or adjective