扔 Origin — Chinese Character Wiki

rēng HSK5

throw

Phonosemantic compound. 扌 represents the meaning and 乃 represents the sound.

Components

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

乃 Sound component

nǎi then

Change in sound

扔 and 乃 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
扔 *njɯŋ
乃 *nˤə(ŋ)ʔ

Regular Modern

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《說文》：“扔，因也。从手，乃聲。”