to check, restrain, or regulate (the flow of a fluid or the emission of sound or light)
to provide with a baffle
(obsolete) to cheat or trick
Also called baffle board, baffle plate. a plate or mechanical device designed to restrain or regulate the flow of a fluid, the emission of light or sound, or the distribution of sound, esp in a loudspeaker or microphone
bafflement, noun baffler, noun
C16: perhaps from Scottish dialect bachlen to condemn publicly; perhaps related to French bafouer to disgrace
1540s, "to disgrace," perhaps a Scottish respelling of bauchle "to disgrace publicly" (especially a perjured knight), which is probably related to Fr. bafouer "to abuse, hoodwink" (16c.), possibly from baf, a natural sound of disgust, like bah (cf. Ger. baff machen "to flabbergast"). Meaning "to bewilder, confuse" is from 1640s; that of "to defeat someone's efforts" is from 1675. The noun sense of "shielding device" is first recorded 1881. Related: Baffled "confounded" (1650s); bafflement (1841).