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1. a weave in which the filling threads are woven over and under two or more warp yarns, producing a diagonal pattern.
2. a fabric with a twill weave.
3. a garment, as trousers, of this fabric.v.t.
4. to weave in the manner of a twill.
5. to weave in twill construction.
[1300–50; north and Scots variant of twilly (n.), Middle English twyle, Old English twilī(c), half translation of Latin bilīc-, s. of bilīx having double thread. See twi-]
contraction of it will.