plural of string to one's bow

(music) A guitar strung with nylon strings and with a neck that joins the body at the twelfth rather than the fourteenth fret, as in a typical guitar.

plural of nylon-string guitar

(colloquial, often humorous, rhetorical question) Used as a response to a question such as "How long will it take?" or "How big is it?" when the length or size is unknown, infinite, variable, or relative.

(idiomatic) Another skill, ability or resource to be used in case of failure.

To have another means or expedient kept in reserve in case the current one fails.