intransitive. Of a horse: to shy; to swerve suddenly from its course in fright or alarm; to bolt (also with adverbs, as aside, astray, etc.).

intransitive to shy, startle.

intransitive. Of a horse: to shy (at). Cf. start, v. 6a(b).

intransitive. In early use, to stumble (cf. founder, v.). Subsequently, to struggle violently and clumsily; to plunge, roll and tumble about in or as…

Of a horse: To shrink or start back or aside through sudden fear. Const. at, rarely from.

intransitive. Of a horse: to start back or to the side suddenly; to shy.

intransitive. Of a horse: to be awkward or disobedient; esp. to refuse to go on at the rider's instruction; to shy. Cf. refuse, v.1 8.

(a) = starter kit n.; (b) U.S. a set of items for starting a car, typically including a battery, cables, etc.