Definition of let / in for phrasal verb from the Oxford Advanced American Dictionary

 

let / in for

 phrasal verb
phrasal verb
 
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Phrasal Verbs

let somebody/yourself in for something

(informal)
 
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to involve someone/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 Learner's Dictionary entry: let / in for