doubling

from The Century Dictionary.

• noun Something doubled or folded over; a fold; a plait; specifically (nautical), the doubled edge or skirt of a sail.
• noun That the addition of which makes double.
• noun pl Naut., that part of a mast included between the trestletrees and the cap.
• noun The second distillation of wine.
• noun The act of marching at the double-quick.
• noun In botany, same as chorisis.
• noun In textile-manuf., any process of combining two (or more) slivers and drawing them into a single sliver of smaller size than any of the separate ones, for the purpose of making more uniform roving.
• noun In weaving, the process of winding two threads or rovings upon a spool or bobbin.
• noun In biology, same as reduplication: said of the chromosomes and centrosomes of the cell when they undergo fission.
• noun In bridge, the act of doubling the value of the trick points after the dealer's side has declared. See bridge.
• noun In the production of metallic antimony from its ore, the remelting of the singles, or lumps of crude metal first obtained, and the mixing, in due proportion, of those containing surplus iron and those containing unseparated sulphur. The product of this second fusion is called bowl-metal because poured out into and solidified in a bowl of cast-iron.
• noun In bookbinding, the thickening of the covers of a book by the addition of thick paper or thin boards.
• Shifting; manœuvering.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of one that doubles; a making double; reduplication; also, that which is doubled.
• noun A turning and winding; ; shift; trick; artifice.
• noun (Her.) The lining of the mantle borne about the shield or escutcheon.
• noun The process of redistilling spirits, to improve the strength and flavor.
• noun raising the stakes in a game, such as a card game or backgammon, by a factor of 2.
• noun etc. (Naut.), sailing around or passing beyond a cape, promontory, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Present participle of double.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun increase by a factor of two
• noun raising the stakes in a card game by a factor of 2