baffleyoudaoicibaDictYouDict[baffle 词源字典]
baffle: [16] The etymology of baffle is appropriately baffling. Two main candidates have been proposed as a source. The first is the medieval Scots verb bawchill or bauchle, meaning ‘discredit publicly’. This fits in with the way baffle was first used: ‘I will baffull your good name, sound with the trumpet your dishonour, and paint your pictor with the heeles vpward, and beate it in despight of yourselfe’, Churchyardes chippes 1570.

The other strand is represented by French bafouer ‘hoodwink, deceive’, which perhaps comes from Old French beffer. This corresponds more closely to the present-day meaning of baffle, and it may well be that there are two distinct words here.
[baffle etymology, baffle origin, 英语词源]
baffle (v.)youdaoicibaDictYouDict
1540s, "to disgrace," 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"). Meaning "to bewilder, confuse" is from 1640s; that of "to defeat someone's efforts" is from 1670s. Related: Baffled; baffling.
baffle (n.)youdaoicibaDictYouDict
"shielding device," 1881, from baffle (v.).