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

To reserve a spot, sign up on Eventbrite by searching Transform 1012 Eastside Community Conversation. — Kamal Morgan, Fort Worth Star-Telegram, 23 July 2026

Some of these transactions might include an additional fee, Bloomberg says, adding that those signing up for the program will have to go through a soft credit check. — Jibin Joseph, PC Magazine, 22 July 2026

Asking these questions before signing up gives couples an exit plan if their situation changes. — Ashley Lynch july 22, Charlotte Observer, 22 July 2026

Before signing up for a rewards credit card, evaluate whether a points program fits your financial habits and goals. — Miranda Marquit, Encyclopedia Britannica, 22 July 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