the state of being calm and in control of your feelings or behaviourto keep/lose/recover/regain your composureHe maintained his composure despite a desperate desire to laugh.Oxford Collocations Dictionaryadjectivecalm,cool,perfect,…verb + composurehold,keep,maintain,…prepositionwith composure Seefull entryWord Originlate 16th cent. (in the sense ‘composing, composition’): from compose + -ure.Extra examplesShe answered with perfect composure.She closed her eyes for a moment, to gather her composure.She totally lost her composure and began shouting.
See composure in the Oxford Advanced American Dictionary