com ‧ po ‧ sure /kəmˈpəʊʒə $ -ˈpoʊʒər/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Origin: compose ]
the state of feeling or seeming calm
recover/regain your composure (=become calm after feeling angry or upset)
Carter looked stunned, but he soon regained his composure.
keep/maintain your composure (=stay calm)
The widow broke down in tears, but her daughters maintained their composure.
He has lost his composure under the pressure of the situation.