Definition of grin from ear to ear
- He was grinning from ear to ear so we knew he had good news to tell us.
: to draw back the lips so as to show the teeth especially in amusement or laughter
: a facial expression produced by grinning especially in pleasure or amusement
: the characteristic vertebrate organ of hearing and equilibrium consisting in the typical mammal of a sound-collecting outer ear separated by the tympanic membrane from a sound-transmitting middle ear that in turn is separated from a sensory inner ear by membranous fenestrae
: any of various organs (as of a fish) capable of detecting vibratory motion
: the external ear of humans and most mammals
: the fruiting spike of a cereal (such as wheat or corn) including both the seeds and protective structures
: to form ears in growing
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