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

Stewards, or those who manage Little Free Libraries, are able to sign up for a chance to stock the winning titles in their own boxes. — Carly Tagen-Dye, PEOPLE, 5 Aug. 2026

But the three women kept going, and after several more stressful minutes, they all got signed up. — Théoden Janes, Charlotte Observer, 5 Aug. 2026

As of 2022, about 170 million people in the US have signed up to donate their organs, but there is always more demand than there are organs available, and less than 1% of donors end up meeting the specific medical criteria to actually donate. — Jen Christensen, CNN Money, 5 Aug. 2026

Uber said more than 100,000 people have signed up to be the first riders. — Lora Kolodny, CNBC, 5 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