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

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories. —Raven Brunner, PEOPLE, 28 Apr. 2026

In the meantime, sign up for our Style Meter newsletter to be the first to know who has the hottest look of the night and to stay updated on future red-carpet events. —Wendy Naugle, USA Today, 28 Apr. 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, Chicago Tribune, 28 Apr. 2026

More than 15,000 engineers have signed up, and over 50 technology companies—including Lovable, ElevenLabs, Synthesia, Granola and Fyxer—are using the service. —Jeremy Kahn, Fortune, 28 Apr. 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