wéi = w + ei2
hello (when answering the phone)
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wèi = w + ei4
hey / to feed (an animal, baby, invalid etc)
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wèi = w + ei4
wèi = w + ei4

喂 character breakdown

kǒu = k + ou3
mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls
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wèi = w + ei4
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