說 Origin — Dong Chinese Dictionary

shuōshuìyuè HSK1

speak

Phonosemantic compound. 言 represents the meaning and 兌 represents the sound.

Components

言 Meaning component

yán speech

兌 Sound component

exchange

Change in sound

說 and 兌 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
說 *l̥ot-s
兌 *lˤot-s

Regular Modern

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《說文》：“說，說釋也。从言、兌。一曰談說。”

Phonosemantic compound. 讠 represents the meaning and 兑 represents the sound.

讠 Meaning component

yán speech

讠 is a component form of 言.

兑 Sound component

duì, ruì, duó exchange

Change in sound

说 and 兑 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
说 *l̥ot-s
兑 *lˤot-s