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sad[sad 词源字典]

sad: [OE] Originally, to feel sad was to feel that one had had ‘enough’. For the word comes ultimately from the same Indo-European base that produced English satisfy and saturate. By the time it reached English (via a prehistoric Germanic *sathaz) ‘enough’ had already become extended to ‘weary’, and the modern sense ‘unhappy’ emerged in the 14th century.

The original notion of ‘sufficiency’ has now died out in the case of sad, but it survives in the case of sated [17], an alteration (probably under the influence of satiate) of the past participle of an earlier verb sade ‘satiate’, which was derived from sad.
=> sated, satiate, satisfy, saturate[sad etymology, sad origin, 英语词源]