Definition of grinch in English:
A person who is mean-spirited and unfriendly.
- We all know it's Christmas, the scrooges and grinches all know it's Christmas and the cash registers at the mall all know it's Christmas.
- I do believe my inner grinch is settling in about a week early this year.
- Why have people suddenly turned into heartless, horrible grinches?
mid 20th century: from the name of the title character in Dr. Seuss's book How the Grinch Stole Christmas! (1957).