plural of bell metal

Any of various parts of the Agave (or similar) plants, when used as soap / Chlorogalum pomeridianum, soap plant, a California native plant used for soap / Sapindus saponaria, wingleaf soapberry

(zoology) Irregular in the character of the tail or abdomen.

(military) An advance through and past enemy lines. / Any major progress; such as a great innovation or discovery that overcomes a significant obstacle.