strop

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.

A bad mood or temper (see stroppy.)

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

To strap.

(recorded since 1842; now most used) To hone (a razor) with a strop.

“One should strop the razor before each shave.”

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.

A poor-quality or unsaleable diamond.