Old English under (prep.) "beneath, among, before, in the presence of, in subjection to, under the rule of, by means of," also, as an adverb, "beneath, below, underneath," expressing position with reference to that which is above, from Proto-Germanic *under- (source also of Old Frisian under, Dutch onder, Old High German untar, German unter, Old Norse undir, Gothic undar), from PIE *ndher- "under" (source also of Sanskrit adhah "below;" Avestan athara- "lower;" Latin infernus "lower," infra "below").
Productive as a prefix in Old English, as in German and Scandinavian (often forming words modeled on Latin ones in sub-). Notion of "inferior in rank, position, etc." was present in Old English. With reference to standards, "less than in age, price, value," etc., late 14c. As an adjective, "lower in position; lower in rank or degree" from 13c. Also used in Old English as a preposition meaning "between, among," as still in under these circumstances, etc. (though this may be an entirely separate root; see understand).
Under the weather "indisposed" is from 1810. Under the table is from 1913 in the sense of "very drunk," 1940s in sense of "illegal" (under-board "dishonest" is from c. 1600). To keep something under (one's) hat "secret" is from 1885; to have something under (one's) nose "in plain sight" is from 1540s; to speak under (one's) breath "in a low voice" is attested from 1832.
charge v.
early 13c., chargen, "to load, put a burden on or in; fill with something to be retained," from Old French chargier "to load, burden, weigh down," from Late Latin carricare "to load a wagon or cart," from Latin carrus "two-wheeled wagon" (see car).
The senses of "entrust," "command," and "accuse" all emerged in Middle English and were found in Old French. The sense of "rush in to attack, bear down upon" is from 1560s, perhaps through the earlier meaning "load a weapon" (1540s). The meaning "impose a burden of expense" is from mid-14c. That of "to fix or ask as a price" is from 1787; the meaning "hold liable for payment, enter a debt against" is by 1889. The meaning "fill with electricity" is from 1748. Related: Charged; charging.