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

• enlist (in)
• enroll (in)
• enter
• join
• sign on (for)

Examples of sign up in a Sentence

they both signed up for a Spanish class

Recent Examples on the Web

The Medicaid program has expanded in the 15 years since the Affordable Care Act, also known as Obamacare, became law, as more states signed up for federal cost-sharing allotments, and people benefited from enhanced federal credits to pay their insurance premiums. —Lisa Mascaro, Chicago Tribune, 10 May 2025

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. —Natasha Dye, People.com, 10 May 2025

Listen to Life Kit on Apple Podcasts and Spotify, and sign up for our newsletter. —Emily Siner, NPR, 10 May 2025

Since 2014, more than 50 million Americans have signed up for health insurance through state exchanges like Covered California. —Calmatters, Mercury News, 28 Apr. 2025

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