Meaning of “express” - Learner’s Dictionary

express

verb [ T ] us uk /ɪkˈspres/
He finds it hard to express his emotions.I would like to express my deep gratitude to all the hospital staff.A number of potential buyers have expressed interest in the building.The medical profession has expressed concern about the new drug.Many readers expressed surprise at the findings.

B2 to show what you think or how you feel using words or actions:

I'm simply expressing my opinion.
These paintings express the terror of war.
[ often reflexive ] You're not expressing yourself (= saying what you mean) very clearly.

(Definition of “express verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)