Pronounced: c’mon – like it looks, noun
Notes: I didn’t know this was a word, but it makes sense
The word fleer means, as a noun, “a sneer or mocking look”. As a verb it means “to grin or laugh coarsely and mockingly”
This came into English the late 1300s
Background / Comments
I feel a bit justified – there is a different word fleer (sounds the same, but pronounced differently [FLEE-uhr] and has a separate origin) that means “one who flees”. So, my guess was correct, but that is not the word under consideration. Our word comes from the Middle English flerien, which is thought to comes from the Scandinavian language: the Norwegian flire (a grin).