Select the most appropriate meaning of the given idiom.

Grin from ear to ear

to smile a lot because of happiness

The most appropriate meaning of the idiom "grin from ear to ear" is to smile a lot because of happiness. It is an informal expression that describes a wide, toothy smile that stretches from one ear to the other. The idiom is thought to have originated in the early 1900s, and it is believed to be a reference to the fact that people often smile when they are happy.

The other options for the meaning of the idiom are incorrect. Making funny faces does not involve smiling from ear to ear. Having very sharp ears does not involve smiling from ear to ear. Ridiculing someone does not involve smiling from ear to ear.