You know what it looks like… but what is it called?
TAKE THE QUIZ“from ear to ear”
The following 2 entries include the term from ear to ear.
grin from ear to ear
idiom: to grin very broadly
smile from ear to ear
idiom: to smile widely : to have a big smile on one's face
Love words? Need even more definitions?
Merriam-Webster unabridged