* He grimaced at the bitter taste of the medicine. (This shows a reaction to something unpleasant)
* The comedian grimaced as he told his most embarrassing story. (This shows a reaction to something awkward or embarrassing)
* She grimaced in pain as she tried to stand up. (This shows a reaction to physical discomfort)
* He grimaced at the thought of having to give a speech. (This shows a reaction to something that causes anxiety or stress)
* The children grimaced as they ate their broccoli. (This shows a reaction to something disliked)
Notice how the word "grimaced" suggests a facial expression of distaste, pain, or discomfort.