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To inhale. A noun (or pronoun) can be used between "breathe" and "in" to indicate the specific substance being inhaled. The doctor held the stethoscope to my chest and asked me to breathe in. After many years of breathing in pollution, I now have asthma. Breathe the fresh air in and try to relax.
breathe something in
to take something into the lungs, such as air, medicinal vapors, gas, etc. Breathe the vapor in slowly. It will help your cold. Breathe in that fresh air!
to inhale; to take air into the lungs. Now, relax and breathe in. Breathe out. Breathe in deeply; enjoy the summer air.
1. To inhale: Don't forget to breathe in and hold your breath before you jump into the water!
2. To take something into the lungs by inhaling: My lungs are unhealthy because I've been breathing in smoke from the factory for so many years. There is poisonous gas here; don't breathe it in.