simple past tense and past participle of compose
"The orchestra played its final notes before composing themselves in their seats."
In plain English: To compose means to put things together carefully, such as writing music or creating art from scratch.
"The chef composed his salad with fresh greens and ripe tomatoes before serving it to the guests."
serenely self-possessed and free from agitation especially in times of stress
"the performer seemed completely composed as she stepped onto the stage"
"I felt calm and more composed than I had in a long time"
showing composure.
"She remained composed even when the crowd began to cheer wildly."