What is an antonym for expression?

There isn't a single perfect antonym for "expression" because it can have several different meanings. Here are some options depending on the context:

For "expression" meaning a way of expressing oneself:

* Suppression: Holding back or concealing one's feelings.

* Silence: Not speaking or communicating.

* Inhibition: A feeling that prevents one from expressing oneself freely.

* Concealment: Hiding or disguising one's true feelings.

For "expression" meaning a phrase or gesture:

* Implication: A suggestion made indirectly.

* Silence: The absence of words or gestures.

* Nonverbal communication: Communicating without using words.

For "expression" meaning a mathematical or scientific formula:

* Interpretation: The explanation or understanding of a formula.

* Simplification: A simplified version of a formula.

* Approximation: An estimate or close representation of a formula.

To determine the best antonym, you need to consider the specific context in which "expression" is used.