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

Join a club or a service organization, sign up for a gym or volunteer to help others who are less fortunate. — Jeanne Phillips, Mercury News, 29 July 2026

The Education Department is offering borrowers a new interest rate reduction incentive for their federal student loans, and time is running out to sign up. — Adam S. Minsky, Forbes.com, 29 July 2026

To get prepared for earthquakes, sign up for The Times’ Unshaken newsletter. — Quakebot july 28, Los Angeles Times, 29 July 2026

Kids up and down the country are being encouraged to sign up online or visit their local library to get involved. — Irenie Forshaw, TheWeek, 29 July 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