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. — Colson Thayer, PEOPLE, 2 July 2026

Don't miss any Taylor Swift news; sign up for the free, weekly newsletter This Swift Beat. — Bryan West, USA Today, 2 July 2026

Many women are looking for experiences that combine independence with community, whether that’s joining a small-group adventure, signing up for a wellness retreat or simply having the confidence to explore a destination on their own. — Laura Begley Bloom, Forbes.com, 1 July 2026

Listen to Life Kit on Apple Podcasts and Spotify, and sign up for our newsletter. — Malaka Gharib, NPR, 1 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