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

Aerial yoga, biohacking, meditation, facials with Tuscan brand Seed to Skin, sound therapy, a healing hammam, and a state-of-the-art fitness room are all on offer, meaning locals are also signing up for memberships. —Condé Nast, Condé Nast Traveler, 31 Mar. 2026

Duplicate subscriptions often happen when different family members sign up separately or when services are billed through platforms like Amazon, Roku or Apple in addition to a credit card. —Joshua Sidorowicz, CBS News, 30 Mar. 2026

During a public hearing last week, the council heard an hour of public testimony about the new agreement with Axon, with 55 people signing up to speak. —Elliott Wenzler, Denver Post, 30 Mar. 2026

To sign up and get it in your inbox, click here. —Eric Sondheimer, Los Angeles Times, 30 Mar. 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