hum
v.
late 14c., hommen "make a murmuring sound to cover embarrassment," later hummen "to buzz, drone" (early 15c.), probably of imitative origin. Sense of "sing with closed lips" is first attested late 15c.; that of "be busy and active" is 1884, perhaps on analogy of a beehive. Related: Hummed; humming. Humming-bird (1630s) so called from sound made by the rapid vibration of its wings.
There is a curious bird to see to, called a humming bird, no bigger then a great Beetle. [Thomas Morton, "New English Canaan," 1637]
n.
mid-15c., from hum, v..
☞ hum, human
词根：hum = earth, 表示“土, 地”
humble a. 谦恭的；下贱的（hum+ble→接近地面→谦恭的）
humility n. 谦让；低下（hum+ility状态→地的状态→低下）
humiliate v. 羞辱，侮辱（hum+iliate使…使人到地上→羞辱别人）
humiliation n. 耻辱（humiliate+ion)
inhume v. 埋葬（in进入+hume→进入土中）
exhume v. 掘出（ex 出+hume→出土→掘出）
posthumous a. 死死的，遗腹的（post后+hum土，引申为死+ous→死后的）
hummock n. 小圆丘（hum+mock圆丘→土丘）
human n. 人类（传说人是由土造出的）
humane a. 有人情的，仁爱的（humane+e→有人情的）
词根：hum = moist (湿）
humid 潮湿的