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The Collaborative International Dictionary of English v.0.48 (gcide)

Double \Dou"ble\, v. t. [imp. & p. p. {Doubled}; p. pr. & vb. n.
{Doubling}.] [OE. doblen, dublen, doublen, F. doubler, fr. L.
duplare, fr. duplus. See {Double}, a.]
1. To increase by adding an equal number, quantity, length,
value, or the like; multiply by two; as, to double a sum
of money; to double a number, or length.
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Double six thousand, and then treble that. --Shak.
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2. To make of two thicknesses or folds by turning or bending
together in the middle; to fold one part upon another part
of; as, to double the leaf of a book, and the like; to
clinch, as the fist; -- often followed by up; as, to
double up a sheet of paper or cloth. --Prior.
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Then the old man
Was wroth, and doubled up his hands. --Tennyson.
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3. To be the double of; to exceed by twofold; to contain or
be worth twice as much as.
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Thus re["e]nforced, against the adverse fleet,
Still doubling ours, brave Rupert leads the way.
--Dryden.
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4. To pass around or by; to march or sail round, so as to
reverse the direction of motion.
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Sailing along the coast, the doubled the promontory
of Carthage. --Knolles.
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5. (Mil.) To unite, as ranks or files, so as to form one from
each two.
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doubled \doubled\ adj.
1. rendered twice as great or twice as many.

Syn: double, duplex, twofold, diploid.
[WordNet 1.5]

2. folded in two; as, doubled sheets of paper.

Syn: doubled over.
[WordNet 1.5] Double dealer