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mid-13c., from Old French humble, earlier humele, from Latin humilis "lowly, humble," literally "on the ground," from humus "earth." Senses of "not self-asserting" and "of low birth or rank" were both in Middle English Related: Humbly; humbleness.
Don't be so humble; you're not that great. [Golda Meir]To eat humble pie (1830) is from umble pie (1640s), pie made from umbles "edible inner parts of an animal" (especially deer), considered a low-class food. The similar sense of similar-sounding words (the "h" of humble was not pronounced then) converged in the pun. Umbles, meanwhile, is Middle English numbles "offal" (with loss of n- through assimilation into preceding article).
late 14c. in the intransitive sense of "to render oneself humble;" late 15c. in the transitive sense of "to lower (someone) in dignity;" see humble (adj.). Related: Humbled; humbling.