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sign on

(also sign up) UK informal phrasal verb with sign
 
 
/saɪn/ verb

Definition

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 from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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