Breathe in Definition 1 of 3Pro Tip 1/3Physical Action Remember, 'breathe in' refers to the physical act of inhaling air. In yoga, you breathe in to prepare for a pose. Pro Tip 2/3Calming Effect 'Breathe in' is often used in contexts suggesting relaxation or stress relief. Breathe in slowly to calm your nerves before the interview. Pro Tip 3/3Paired with Exhale It's commonly used with 'breathe out', especially in fitness or meditation. Breathe in through your nose, then breathe out through your mouth.