Etymology
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baffle (v.)

1540s, "to disgrace," of uncertain origin. Perhaps a Scottish respelling of bauchle "to disgrace publicly" (especially a perjured knight), which is probably related to French bafouer "to abuse, hoodwink" (16c.), possibly from baf, a natural sound of disgust, like bah (compare German baff machen "to flabbergast"). The original sense is obsolete. Meaning "defeat someone's efforts, frustrate by interposing obstacles or difficulties" is from 1670s. Related: Baffled; baffling.

baffle (n.)

"shielding device," especially in a stove or oven, 1881 (short for baffle-plate), from baffle (v.). Earlier in the same sense was baffler (1861).

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Definitions of baffle
1
baffle (v.)
be a mystery or bewildering to;
baffle (v.)
hinder or prevent (the efforts, plans, or desires) of;
Synonyms: thwart / queer / spoil / scotch / foil / cross / frustrate / bilk
baffle (v.)
restrain the emission of (sound, fluid, etc.);
Synonyms: regulate
2
baffle (n.)
a flat plate that controls or directs the flow of fluid or energy;
Synonyms: baffle board
From wordnet.princeton.edu