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As in chewing or crunching on something, specifically when something is
chewing loudly or roughly, like an animal eating.
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question
word-requests onomatopoeia
What the Japanese onomatopoeia for crunch?
It partially depends on what is eaten.

  * [くちゃくちゃ](https://dictionary.goo.ne.jp/word/%E3%81%8F%E3%81%A1%E3%82%83%E3%81%8F%E3%81%A1%E3%82%83/#jn-62167) is a standard one for chewing e.g., meat.
  * [ぐちゃぐちゃ](https://dictionary.goo.ne.jp/word/%E3%81%90%E3%81%A1%E3%82%83%E3%81%90%E3%81%A1%E3%82%83/#jn-62168) can be used similarly. This is more rough, like wolves biting something drippy.
  * [がつがつ](https://dictionary.goo.ne.jp/word/%E3%81%8C%E3%81%A4%E3%81%8C%E3%81%A4/#jn-42536) sounds like biting something crispier (e.g., biting bones).

Cf.

  * [擬音語・擬態語 ー 食べる、飲む](https://www.rondely.com/zakkaya/dic5/eat.htm)
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2023-01-10T04:48:43.237
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answer
When chewing soft food loudly with mouth a bit open, I use くちゃくちゃ. It may
become くっちゃくっちゃ or ぐちゃぐちゃ, depending on person and area. I guess, many
Japanese people hate to hear the sound from such a way of eating, and this
word may contain such attitude hating the chewing sound.

When chewing hard food (like rice cracker) and making sound, I use ぼりぼり. If
the food is so much hard (like ice cubes or fish bones), then I may choose
がりがり or ばりばり.

If you want to express the attitute of eating, then もりもり gives positive and
enthusiastics impression. For example, I chose it when kids are eating well
for good health.

On the other hand, がつがつ gives negative impression and it may represent eating
habit with bad manners. I also use it when eating with so much hunger, but I
don't mean much negative sense in this case.

The choice of the words would differ depending on how you feel about the habit
or the behaviour.
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answer