Definition of let in for phrasal verb from the Oxford Advanced Learner's Dictionary

 

let in for

 phrasal verb
phrasal verb
 
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Phrasal Verbs

let somebody in for something

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let yourself in for something

 
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(informal) to involve somebody/yourself in something that is likely to be unpleasant or difficult I volunteered to help, and then I thought ‘Oh no, what have I let myself in for!’
See the Oxford Advanced American Dictionary entry: let in for