gall 2 
(gôl)
(gôl)n.
1. A skin sore caused by friction and abrasion: a saddle gall.
2.
a. Exasperation; vexation.
b. The cause of such vexation.
v. galled, gall·ing, galls
v.tr.
1. To irk or exasperate; vex: It galled me to have to wait outside.
2. To wear away or make sore by abrasion; chafe:
v.intr.
To become worn or sore by abrasion.
[Middle English galle, from Old English gealla, possibly from Latin galla, nutgall.]