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

Seven people had signed up to speak about Flock cameras 30 minutes before the start of the meeting. — Charlotte Observer, 26 Aug. 2026

Since student loan scams can involve attempts to steal sensitive personal or financial information, sign up for a credit monitoring or identity theft protection service. — Andreina Rodriguez, CNBC, 26 Aug. 2026

Some supporters received a free season ticket after signing up to the club’s Premier League package in previous seasons. — Matt Woosnam, New York Times, 26 Aug. 2026

How to sign up for Imagination Library Children from birth to age 5 are eligible to receive books from the Imagination Library. — Clare Mulroy, USA Today, 26 Aug. 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