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English definition of “sign on”

sign on

verb uk phrasal verb with sign   /saɪn/ us  

(NO JOB)

UK informal to sign a form at a government office to say that you do not have a job and that you want to receive benefit (= money paid by the government)

(AGREE TO HELP)

mainly US (UK sign up) to agree to become involved in an organized activity: [+ to infinitive] mainly US I've signed on to help at the school fair. UK informal (also sign up) to sign a document saying that you will work for someone or do a particular job or activity: She's signed on with a temp agency. Julie has signed up for courses on English and French this year.
(Definition of sign on from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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