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

Community members of all ages are welcome, and those interested can sign up online. —Mamie Bah, CBS News, 16 Mar. 2026

Dig deep and sign up for Entertainment Weekly's free Survivor Weekly newsletter to have all the latest news, interviews, and commentary sent right to your inbox. —Dalton Ross, Entertainment Weekly, 16 Mar. 2026

Check out our Daily Deals for the best products at the best prices and sign up here to receive the BestReviews weekly newsletter full of shopping inspo and sales. —Bestreviews, Mercury News, 16 Mar. 2026

Want the latest baseball news Subscribe to the Chicago Tribune to read it all — and sign up for our Cubs Insider and White Sox Insider newsletters. —Meghan Montemurro, Chicago Tribune, 16 Mar. 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