Focus on breath.
Meaning: This means to pay close attention to your breath as a way to calm your mind and focus your thoughts. For example, a meditation teacher might say this to a student during a guided meditation session.
Choice of Words: Focus is a verb that means to direct one's attention or effort towards something. On is a preposition that indicates a relationship between two things. Breath is a noun that refers to the air that is inhaled and exhaled during respiration. Here, it suggests directing one's attention to the act of breathing.
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