goad (n.) Look up goad at Dictionary.com
Old English gad "point, spearhead, arrowhead," from Proto-Germanic *gaido (cognates: Lombardic gaida "spear"), from PIE root *ghei- (1) "to propel, prick" (cognates: Sanskrit hetih "missile, projectile," himsati "he injures;" Avestan zaena- "weapon;" Greek khaios "shepherd's staff;" Old English gar "spear;" Old Irish gae "spear"). Figurative use is since 16c., probably from the Bible.
goad (v.) Look up goad at Dictionary.com
1570s, from goad (n.); earliest use is figurative. Related: Goaded; goading.