Breathing fire is an idiom used to describe someone who is angry, irritable or aggressive. The antonyms to this phrase may include being calm, composed, peaceful, relaxed, tranquil or serene. These words represent the opposite of being agitated, enraged or upset. For people who find themselves frequently breathing fire, learning to cultivate a calmer disposition will help them to handle difficult situations without reacting with anger. Practicing mindfulness, meditation and deep breathing are some simple techniques that individuals can use to manage their emotions and stay composed. By building self-awareness and prioritizing emotional regulation, one can become the complete antithesis to being someone who breathes fire.