Grinchnoun
/ɡrɪntʃ//ɡrɪntʃ/[ C ] mainly US disapproving also grinch a person who does not like other people celebrating or enjoying themselves, especially a person who does not like Christmas:
The orchestra played "Sleigh Ride", and if you hate that you are a Grinch.
the Grinch
a character in a 1957 story by Dr Seuss, "How the Grinch Stole Christmas", who hates Christmas and tries to spoil it for others