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a. Multiplied by a specified number: a twofold increase in sales.
b. Divided by a specified number: a fivefold reduction in air pollution.
2. Having a specified number of parts: a threefold plan for fighting poverty.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
suffix forming adjectives, suffix forming adverbs
having so many parts, being so many times as much or as many, or multiplied by so much or so many: threefold; three-hundredfold.
[Old English -fald, -feald]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. to bend (cloth, paper, etc.) over upon itself.
2. to bring into a compact form by bending and laying parts together: to fold up a map.
3. to bring together and intertwine or cross: He folded his arms on his chest.
4. to bend or wind; entwine: The child folded his arms around my neck.
5. to bring (the wings) close to the body, as a bird on alighting.
6. to enclose; wrap; envelop: to fold something in paper.
7. to embrace or clasp; enfold: to fold someone in one's arms.
8. to place (one's cards) facedown so as to withdraw from the play.
9. Informal. to bring to an end; close up: to fold a business.v.i.
10. to be folded or be capable of folding.
11. to place one's cards facedown so as to withdraw from the play.
a. to fail, esp. to go out of business: The magazine folded after a few years.
b. to end a run; close: The show will fold next week.
13. fold in, to blend (a cooking ingredient) into a mixture by gently turning one part over another: Fold in the egg whites.
14. fold out or down, to spread or open up; unfold.n.
15. a part that is folded; pleat; layer: folds of cloth.
16. a line, crease, or hollow made by folding.
17. a hollow place in undulating ground.
18. a portion of rock strata that is folded or bent, as an anticline or syncline, or that connects horizontal strata, as a monocline.
19. a coil of a serpent, string, etc.
20. the act of folding or doubling over.
21. a margin or ridge formed by the folding of a membrane or other flat body part; plica.
[before 900; Middle English folden, falden, Old English fealdon]
1. an enclosure for sheep.
2. the sheep kept within it.
3. a flock of sheep.
4. a church or its members.
5. a group sharing common beliefs, values, etc.: to rejoin the fold.v.t.
6. to confine (sheep or other domestic animals) in a fold.
[before 900; Middle English fold, fald, Old English fald, falod]
a combining form meaning “having the number of kinds or parts” or “multiplied the number of times” specified by the initial element: fourfold; manyfold.
[Middle English; Old English -fald, -feald, c. Old Frisian, Old Saxon -fald, Old High German -falt, Old Norse -faldr, Gothic -falths, all representing the Germanic base of fold1; akin to Greek -ploos, -plous (see diplo-), Latin -plus (see double), -plex -plex]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.