パンの耳? How did 耳 end up meaning edge/crust? 100% a curiosity question, but I recently stumbled across some older blog posts about a silly debate of "should you eat all your pizza crust?" and I was surprised to see the phrase > Most of the time when I've seen the word crust its' been or . So as more of an etymological inquiry, does anyone know how exactly end up meaning crust or edge? My usual Jisho and Wiktionary sources are leaving me dry and through my own search, I could find plenty on the Chinese etymology with 's relation to ear. Likewise it's obvious how selvage, crust, and edge are all related, but I couldn't find anything that connects the two. Seeing as both and are used, I'm not sure if it's something that would trace back to the introduction of (Western) breads or pizza to Japan (since who knows which usage came first) or is something as simple as 'ears are on the edge of your face'.

This is simply because 'ears are on the edge of your face'. The edge of a coin was also called in the past, and is still commonly used as an idiom.

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(By the way, I didn't know this part is called "heel" by many English speakers.)