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 The original sense is obsolete.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).

updated on April 07, 2017

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Definitions of baffle from WordNet
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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.