To wear an unhappy or overly serious expression

to pull a long face or show one's anger through facial expressions; to grimace with displeasure at someone

To observe another person's facial expressions to see how they are feeling; to depend on another's favor or be subject to their cold treatment.

a severe or cold facial expression; a look of displeasure or indifference

(variant form) to act without shame or to behave thick-skinned

To show one's displeasure or anger through facial expressions; to give someone a dirty look.

to steel oneself against embarrassment or difficulty; to force oneself to do something against one's wishes