bounder n.

late 14c., "to form the boundary of," also "to set the boundaries of, confine within limits;" late 15c., "to be a boundary of, abut, adjoin," from bound (n.1). Related: Bounded; bounding.

"to leap, spring upward, jump," 1590s, from French bondir "to rebound, resound, echo," from Old French bondir "to leap, jump, rebound;" originally "make a noise, sound (a horn), beat (a drum)," 13c., ultimately "to echo back," from Vulgar Latin *bombitire "to buzz, hum" (see bomb (n.)), perhaps on model of Old French tentir, from Vulgar Latin *tinnitire.

c. 1300, "boundary marker," from Anglo-Latin bunda, from Old French bonde "limit, boundary, boundary stone" (12c., Modern French borne), a variant of bodne, from Medieval Latin bodina, which is perhaps from Gaulish.

It is attested from mid-14c. as "an external limit, that which limits or circumscribes;" figuratively, of feelings, etc., from late 14c. From late 14c. as "limits of an estate or territory." Now chiefly in the phrase out of bounds, which originally referred to limits imposed on students at schools (by 1751); the other senses generally have gone with boundary.