(vulgar, slang) A school prank involving taking a person's nipple between the thumb and forefinger and then twisting it around roughly.

Happening twice each week; semi-weekly.

Twice each week; semi-weekly.

Happening twice each year; semi-annual; biannual.

(UK & Commonwealth) Twice each year; semi-yearly; biannually.

(of cousins) Separated by two generations of descent

A tough fabric originally used for American football pants. As newer fabrics were created and tackle twill was replaced with other materials such as Lycra, its primary use became lettering (name and number embroidery), as on athletic apparel.

(weaving) A pattern, characterised by diagonal ridges, created by the regular interlacing of threads of the warp and weft during weaving. / A cloth or portion of cloth woven in such a pattern.

(transitive) To weave (cloth, etc.) so as to produce the appearance of diagonal lines or ribs on the surface.

In any situation, however well planned, something can always go wrong.