Sentence:  The <WSD>twill</WSD> weave is always given a direction; a right-hand <WSD>twill</WSD> is one in which the <WSD>twill</WSD> line runs from bottom left to top right and a left-hand <WSD>twill</WSD> is one in which the <WSD>twill</WSD> line runs from bottom right to top left. The angle of the <WSD>twill</WSD> is determined by the amount of shift in the points of interlacing. 
Meaning of the word marked with <WSD> tags:  A pattern, characterised by diagonal ridges, created by the regular interlacing of threads of the warp and weft during weaving.