bonnet

Etymology

From Middle English bonet, from Middle French bonet (Modern French bonnet), from Old French bonet (“material from which hats are made”), from Frankish *bunni (“that which is bound”), from Proto-Germanic *bundiją (“bundle”), from Proto-Indo-European *bʰendʰ- (“to tie”). Compare also Late Latin abbonis, obbonis (“ribbon of a headdress”), also of Germanic origin, from Frankish *obbunni, from *ob- (“above, over”) + *bunni. Cognate with Old High German gibunt (“band, ribbon”), Middle Dutch bont (“bundle, truss”), Gothic 𐌲𐌰𐌱𐌿𐌽𐌳𐌹 (gabundi, “bond”). More at over, bundle.

noun

1. A type of hat, once worn by women or children, held in place by ribbons tied under the chin.
   “Now,” said he, “put such a bonnet as that in the show window.” He did not fill his show-window up town with a lot of hats and bonnets to drive people away, and then sit on the back stairs and bawl because people went to Wanamaker's to trade. 2008, Russell H. Conwell, Robert Shackleton, Acres of Diamonds, page 37
2. A traditional Scottish woollen brimless cap; a bunnet.
3. (by extension) The polishing head of a power buffer, often made of wool.
   Make sure that the power buffer's lamb's-wool bonnet is clean. Change or rinse the bonnet frequently to avoid scratching the finish. Use the bonnet as a mitten to buff in the crevices and other areas that the power buffer can't reach. 2008, The Editors of Popular Mechanics, Popular Mechanics Complete Car Care Manual, page 297
4. (Australia, Britain, New Zealand, South Africa, automotive) The hinged cover over the engine of a motor car; a hood.
   The car is burgundy red, wide and elegant, ten years old but still the boys are impressed and they run to touch it, pressing sticky handprints against the polished bodywork and trying to climb up onto the bonnet. 2003, Jon McGregor, If Nobody Speaks of Remarkable Things, page 189
   People were reluctant to slam a bonnet shut in those days. One just did not slam bonnets and doors. 2004, David Spencer, quoted in Don Loffler, The FJ Holden: A Favourite Australian Car, page 217
   By about 20 ms, there is contact between the bonnet leading edge and the pedestrian upper leg/pelvis on the struck side, the severity of which depends on the vehicle shape. 2009, Ciaran Simms, Denis Wood, Pedestrian and Cyclist Impact: A Biomechanical Perspective, page 38
   Stoll was still standing on the car bonnet with the catch of his large-calibre repeating rifle off. 2009, Stefan Aust, Anthea Bell, Baader-Meinhof: the inside story of the R.A.F., page 308
5. (nautical) A length of canvas attached to a fore-and-aft sail to increase the pulling power.
   And standing along to the Westward, this night we tryed with our mayne coarse and bonnet. On Saturday night we came to an anker, in three fathomes against Sewramo. 1596, Thomas Masham, “The Third Voyage set forth by Sir Walter Ralegh to Guiana”, in Richard Hakluyt, editor, The Principal Navigations, Voyages, Traffics and Discoveries of the English Nation, volume 3, London, page 695
6. (obsolete, slang) An accomplice of a gambler, auctioneer, etc., who entices others to bet or to bid.
7. The second stomach of a ruminant.
8. (historical) A ducat, an old Scottish coin worth 40 shillings.
9. Anything resembling a bonnet (hat) in shape or use.
   1. A small defence work at a salient angle; or a part of a parapet elevated to screen the other part from enfilade fire.
   2. A metallic canopy, or projection, over an opening, as a fireplace, or a cowl or hood to increase the draught of a chimney, etc.
   3. A frame of wire netting over a locomotive chimney, to prevent escape of sparks.
   4. A roofing over the cage of a mine, to protect its occupants from objects falling down the shaft.
   5. In pumps, a metal covering for the openings in the valve chambers.
   6. (mycology) A mushroom of the genus Mycena.

verb

1. (transitive) To put a bonnet on.
2. (obsolete) To take off the bonnet or cap as a mark of respect; to uncover.
3. (dated, transitive) To pull the bonnet or cap down over the eyes of.