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

Meanwhile, the share of people who signed up for silver plans declined to 61% from 67% of enrollees. —Greg Iacurci, CNBC, 24 Feb. 2026

Try it straight from the source at the historic Craighton Estate overlooking Kingston, or sign up for a tour that includes hiking and biking across multiple spots in the mountains. —Carley Rojas Avila, Travel + Leisure, 23 Feb. 2026

Dig deep and sign up for Entertainment Weekly's free Survivor Weekly newsletter to have all the latest news, interviews, and commentary sent right to your inbox. —Dalton Ross, Entertainment Weekly, 23 Feb. 2026

Click or tap here to sign up for our Rangers newsletter. —Shawn McFarland, Dallas Morning News, 23 Feb. 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