What is the meaning of Grimace?

A contorted facial expression, often expressing contempt or pain.

Affectation, pretence.

To make grimaces; to distort one's face; to make faces.

grimace

inflection of grimacer:

  1. first/third-person singular present indicative/subjunctive
  2. second-person singular imperative

first/third-person singular present indicative/subjunctive

second-person singular imperative

Source: wiktionary.org