late Old English shortened form of Old English ofdune "downwards," from dune "from the hill," dative of dun "hill" (see down (n.2)). A sense development peculiar to English.
Used as a preposition since c.1500. Sense of "depressed mentally" is attested from c.1600. Slang sense of "aware, wide awake" is attested from 1812. Computer crash sense is from 1965. As a preposition from late 14c.; as an adjective from 1560s. Down-and-out is from 1889, American English, from situation of a beaten prizefighter. Down home (adj.) is 1931, American English; down the hatch as a toast is from 1931; down to the wire is 1901, from horse-racing. Down time is from 1952. Down under "Australia and New Zealand" attested from 1886; Down East "Maine" is from 1825.
"soft feathers," late 14c., from Old Norse dunn, perhaps ultimately from PIE root *dheu- (1) "to fly about (like dust), to rise in a cloud."
Old English dun "down, moor; height, hill, mountain," from Proto-Germanic *dunaz- (cf. Middle Dutch dunen "sandy hill," Dutch duin, "probably a pre-insular loan-word from Celtic" [Cambridge Dictionary of English Place-Names], in other words, borrowed at a very early period, before the Anglo-Saxon migration.
The non-English Germanic words tend to mean "dune, sand bank" (cf. dune), while the Celtic cognates tend to mean "hill, citadel" (cf. Old Irish dun "hill, hill fort;" Welsh din "fortress, hill fort;" and second element in place names London, Verdun, etc.).
From PIE root *dheue- "to close, finish, come full circle." Meaning "elevated rolling grassland" is from c.1300. German Düne, French dune, Italian, Spanish duna are said to be loan-words from Dutch.
1560s, from down (adv.). Related: Downed; downing.
Old English muþ "mouth, opening, door, gate," from Proto-Germanic *munthaz (cf. Old Saxon, Old Frisian muth, Old Norse munnr, Danish mund, Middle Dutch mont, Dutch mond, Old High German mund, German Mund, Gothic munþs "mouth"), with characteristic loss of nasal consonant in Old English (cf. tooth, goose, etc.), from PIE *mnto-s (cf. Latin mentum "chin"). In the sense of "outfall of a river" it is attested from late Old English; as the opening of anything with capacity (a bottle, cave, etc.) it is recorded from c.1200. Mouth-organ attested from 1660s.
c.1300, "to speak," from mouth (n.). Related: Mouthed; mouthing. Old English had muðettan "to blab."
n. pl. mouths (mouðz)
The body opening through which an animal takes in food.
The oral cavity.
The opening to any cavity or canal in an organ or a bodily part.
downer (1960s+ Narcotics)
[cool and teenager senses perhaps fr jazz musicians' terms like low down and down and dirty used to praise gutbucket and other jazz when especially well played]
Impudence; backtalk; sass: I've had about enough of your mouth (1926+)
: They jounced and mouthed each other
bad-mouth, bigmouth, blow off one's mouth, cotton mouth, foot-in-mouth disease, foulmouth, foulmouthed, from the horse's mouth,loudmouth,motor-mouth,mushmouth, poor-mouth, ratchet-mouth, run off at the mouth, shoot off one's mouth, smartmouth, watch one's mouth, zip one's lip