He uses a lot of informal expressions.
'"A can of worms" is an expression which means "a difficult situation."
With th[ese] kind[s] of videos, they could learn words and expressions used every day by normal people talking to normal people. (First Certificate in English; B2; Spanish)
facial expressions
He had such a sad expression on his face.
I could tell from her expression that something serious had happened.
He had a funny expression on his face. (First Certificate in English; B2; Swedish)
He wrote her a poem as an expression of his love.
We've received a lot of expressions of support for our campaign.
Freedom of expression is a basic human right.
It's better to give expression to your anger, rather than hiding it.
It always thrilled me, the energy and expression this dance had. (First Certificate in English; B2; German)