Reveal or portray one's feelings or views through speech, writing, some form of art, or behavior. For example, I find it hard to express myself in Italian, or Helen expresses herself through her painting, or Teenagers often express themselves through their attire, haircuts, and the like. [Mid-1500s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use express oneself in a sentence
It is not enough to express oneself in the same tone of deference that Muslims do when talking or writing about their religion.
That incident clearly demonstrates how difficult and delicate it is to express oneself in a tongue other than one's own.'A Fantasy of Far Japan | Baron Kencho Suyematsu
It was done from the fulness of youthful energy, and from the desire to express oneself that was "in the air."Fraternity | John Galsworthy
Now I have noticed that at one time it is much easier to express oneself in a foreign language than at another.An Irishman's Difficulties with the Dutch Language | N.A. Cuey-na-Gael
Still, it is difficult to express oneself feelingly to order.Long Odds | Harold Bindloss
Moreover, the personal factor in the case of Sin, if one may express oneself thus, is not as strong as in that of some other gods.The Religion of Babylonia and Assyria | Morris Jastrow