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

Save with grocery store fuel rewards programs Many grocery stores offer points that can be used to discounts as nearby gas station for shoppers who sign up for their rewards program. —Keith Laing, USA Today, 10 Mar. 2026

Pay a little more, and kids can sign up for craft sessions to make dream catchers or paint ceramic Boholano figures. —Condé Nast, Condé Nast Traveler, 10 Mar. 2026

To sign up to get this newsletter delivered every Monday to your inbox, click here. —Marisa Ingemi, Los Angeles Times, 9 Mar. 2026

About 23 million people signed up for ACA coverage during this year’s open enrollment period, which ended in January, according to the latest data from the Centers for Medicare and Medicaid Services. —Berkeley Lovelace Jr, NBC news, 9 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