The kanji 替 primarily conveys the idea of "to exchange," "to replace," "to substitute," or "to change." It implies a swapping or substitution of one thing for another.

・On-yomi (音読み): タイ (tai) ・Kun-yomi (訓読み): か（える） (ka(eru)) - to change, to replace; か（わる） (ka(waru)) - to be replaced

⚫︎ 取り替える Translation: To exchange; to replace; to change ⚫︎ 両替 Translation: Currency exchange ⚫︎ 身代わり Translation: A substitute; a proxy; someone to take the place of another

The kanji 替 is a phono-semantic compound (形声文字, けいせいもじ). ⚫︎ The phonetic component is 㚘 (tai, derived from the character representing "to go") indicating sound. ⚫︎ The semantic component is 曰 (sun or mouth) suggesting speaking or communication ⚫︎ The combination suggests that the meaning is related to changing or replacing, something said or proposed. Over time, the form evolved.