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. —Jack Smart, PEOPLE, 2 Dec. 2025

Why would someone who made $42 million in his career and was living a comfortable life since retiring 15 years ago sign up to work nights, weekends and holidays? —Dan Pompei, New York Times, 2 Dec. 2025

Start shopping before the deals are gone, and don’t forget to sign up for a free 30-day Amazon trial to get full access to all the discounts available. —Anne Taylor, Travel + Leisure, 1 Dec. 2025

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, 1 Dec. 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