fret

[1]	worry , be concerned , agonize , lose sleep , be upset/distressed/anxious/disturbed , grieve , brood , whine , fuss , complain , (Colloq) stew , tear one's hair
[2]	worry , concern , distress , vex , annoy , irritate , torment , provoke , (US) rankle
[3]	fuss , niggle
[4]	chafe , gall
[5]	eat into , rankle , grate
[6]	choke , gag
[7]	rub , fray , chafe , scratch
[8]	erode , eat away
[9]	eat away

[1]	stew , sweat , lather , swither
[2]	worn spot
[3]	Greek fret , Greek key , key pattern