From Longman Dictionary of Contemporary Englishbreathe in phrasal verbBREATHEto take air into your lungs → inhale The doctor made me breathe in while he listened to my chest.breathe something ↔ in Wyatt breathed in the cool ocean air. → breathe→ See Verb table
Examples from the Corpus
breathe in• Every time I breathe in I get a pain in the left side of my chest.• They stood on the cliff breathing in the fresh sea air.• I put my handkerchief over my nose to avoid breathing in the smoke. 