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| | Online Etymology Dictionary |
 | | "on the ground," from humus "earth." Senses of "not self-asserting" and "of low birth or rank" were both in M.E. The verb is c.1380 in the intrans. |
 | | with humus "earth"), related to umere "be wet, moist," and to uvescere "become wet." In ancient and medieval physiology, "any of the four body fluids" (blood, phlegm, choler, and melancholy or fl bile) whose relative proportions were thought to determine state of mind. |
 | | This led to a sense of "mood, temporary state of mind" (first recorded 1525); the sense of "amusing quality, funniness" is first recorded 1682, probably via sense of "whim, caprice" (1565), which also produced the verb sense of "indulge," first attested 1588. |
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