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

• 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 juicy celebrity news to compelling human interest stories. —Gabrielle Rockson, People.com, 27 June 2025

Teams are allowed to sign up to three players to two-way contracts, deals that pay half the NBA minimum salary and allow players to be on active rosters for 50 of the 82 regular-season games. —Ira Winderman, Sun Sentinel, 27 June 2025

Other options include signing up for newsletters and watching short advertisements. —Chris Morris, Fortune, 27 June 2025

For weekly updates on all the most pivotal and dramatic moments from Diddy’s trial, sign up for our newsletter: Court Appearances: United States v. Diddy, and check out the rest of our trial coverage here. —Victoria Bekiempis, Vulture, 27 June 2025

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