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

More than 11,000 athletes are signed up from 45 countries and regions in Asia. — ABC News, 9 Sep. 2026

Ampere found that 45 percent of those who signed up for Netflix’s first Christmas game in 2024 were still active one year later. — Jacob Feldman, Sportico.com, 9 Sep. 2026

Insulet is responding with more patient support, greater involvement from primary care physicians and sales incentives that reward 90-day retention rather than simply signing up new users. — Harvey Stober, CNBC, 1 Sep. 2026

Customers who sign up for one of DirecTV’s Signature packages — Entertainment, Choice, Ultimate or Premier — can get two months of the Movies Extra Pack + Peacock at no cost. — Erin Lassner, HollywoodReporter, 31 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