Definition of block in phrasal verb from the Oxford Advanced American Dictionary

 

block in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

block somebody/somethingin

 
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to prevent a car from being able to be driven away by parking too close to it He found that his car had been blocked in.

block somethingin

 
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to draw or paint something roughly, without showing any detail I have blocked in the shapes of the larger buildings.
See the Oxford Advanced Learner's Dictionary entry: block in