to remain calm and composed; showing a natural and steady expression despite stress or danger

to not move a muscle; to remain calm and composed without showing any change in facial expression or attitude even in the face of danger or crisis

to look calm and at ease; having a happy and composed expression

to show no sign of change in facial expression or attitude, especially when facing danger or difficult circumstances; to be calm and collected

to not show one's feelings or intentions through facial expression or manner

looking dejected and depressed in appearance or expression