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

Authorities declined to say how many former fighters had signed up. — Arkansas Online, 17 Oct. 2026

People signed up for the free rally tickets on the online RSVP page who planned not to use them, an attempt to leave seats empty in the arena. — Lisa Gutierrez, Kansas City Star, 16 Oct. 2026

Trial length and offers vary by subscription, so check the latest deal before signing up. — Sophie Dunne, HollywoodReporter, 15 Oct. 2026

To protect against identity theft, Maimon recommends checking your credit report often and signing up for identity theft protection services. — Joan Murray, CBS News, 15 Oct. 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