sign on

verb

signed on; signing on; signs on

intransitive verb

1

: to engage oneself by or as if by a signature

signed on to the new project

2

: to announce the start of broadcasting for the day

sign-on

ˈsī-ˌnȯn 

-ˌnän

noun

Synonyms of sign on

• sign up (for)
• join
• enter
• enroll (in)
• rejoin
• enlist (in)

Examples of sign on in a Sentence

I signed on for the crew team simply as a lark

Recent Examples on the Web

More than 100 women’s college basketball players signed on to unionize with the United College Athletes Association, the organization announced on Friday. — Justin Williams, New York Times, 31 July 2026

All of this was spelled out in municipal planning codes before Marriott signed on to join The Row at Reston Station. — Paula Conway, Forbes.com, 31 July 2026

The inevitable directorial dance of seduction to lure the reluctant actor to sign on to the project turns into an actual seduction, in ways that prove personally and artistically consequential for both women. — Richard Brody, New Yorker, 31 July 2026

About 6% of residents over 18 signed on, signalling, Rice said, that street safety is a popular issue. — Ariane Lange, Sacbee.com, 31 July 2026

Word History

First Known Use

1879, in the meaning defined at sense 1

Rhymes for sign on

• anton
• argon
• axon
• baronne
• baryon
• baton
• boron
• buisson
• bygone
• capon
• cardon
• chiffon

Kids Definition

sign on

verb

(ˈ)sī-ˈnȯn, 

-ˈnän

1

: to hire oneself by or as if by a signature

signed on as a member of the crew

2

: to announce the beginning of broadcasting