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"汰" originated as a Chinese character, a phono-semantic compound (形声) composed of two elements. The semantic component is the "water" radical (氵, sanzui), indicating a meaning related to liquid or washing. The phonetic component is "太" (ta/futo-i), which provides the "ta" sound but also contributes meaning. "太" itself means "thick," "fat," or "great," and in this context, it implies an abundance or excess of water. The character's core meaning is "to wash," "to rinse," or "to cleanse," specifically by using a large quantity of water to carry away impurities. The process of washing and rinsing inherently involves the separation of wanted items from unwanted dirt or dross. This concept of separation through cleansing is the direct source of its extended meaning, "to select" or "to choose." To "select" is metaphorically to wash away the inferior options, leaving only the chosen, superior ones behind. This character was created in China and arrived in Japan, like most kanji, between the 5th and 8th centuries via the Korean peninsula, primarily through the importation of Chinese Buddhist sutras and classical texts. Historically, the character has been used in both its literal and metaphorical senses. In modern Japanese, while the meaning "to wash" is preserved in some contexts, the meaning "to select" is now dominant and more common. This is evident in words like 選択 (sentaku, selection) and 淘汰 (tōta, elimination, culling), where 淘汰 originally referred to the natural "washing away" or "sifting out" of the less fit, a concept directly borrowed into the term 自然淘汰 (shizen tōta, natural selection). This etymological journey from a physical action with water to an abstract process of choice demonstrates a common path of semantic shift in kanji.