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English definition of “sign on”

sign on

(AGREE TO HELP) phrasal verb with sign     /saɪn/ verb
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 .Taking part and getting involvedGetting involved for one's own benefit or against others' will 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 .Signing and signatures
(Definition of sign on (AGREE TO HELP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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