"chewing" in the noun sense
1. chew, chewing, mastication, manduction
biting and grinding food in your mouth so it becomes soft enough to swallow
"chewing" in the verb sense
1. chew, masticate, manducate, jaw
chew (food to bite and grind with the teeth
"He jawed his bubble gum"
"Chew your food and don't swallow it!"
"The cows were masticating the grass"
Source: WordNet® (An amazing lexical database of English)
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