A strap; more specifically a piece of leather or a substitute (notably canvas), or strip of wood covered with a suitable material, for honing a razor, in this sense also called razor strop.

(nautical) A piece of rope spliced into a circular wreath, and put round a block for hanging it.

(Britain, Ireland, Australia, New Zealand) A bad mood or temper.

(slang) A poor-quality or unsaleable diamond.

To hone (a razor or knife) with a strop.

(computing) To mark a sequence of letters syntactically as having a special property, such as being a keyword, e.g. by enclosing in apostrophes as in 'foo' or writing in uppercase as in FOO.