sign on

— Phrasal Verb with sign

/saɪn/ verb [I, T]

Definition

START WORK › to sign a document saying that you will work for someone: She's signed on with a temp agency.

NOT IN WORK UK › to sign a form at a government office to say that you do not have a job and that you want to receive money from the government

(Definition of sign on from the Cambridge Learner's Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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