amble (v.) Look up amble at Dictionary.com
early 14c., from Old French ambler, of a horse or other quadruped, "go at a steady, easy pace" (12c.), from Latin ambulare "to walk, to go about, take a walk," perhaps a compound of ambi- "around" (see ambi-) and -ulare, from PIE root *el- "to go" (source also of Greek ale "wandering," alaomai "wander about;" Latvian aluot "go around or astray"). Until 1590s used only of horses or persons on horseback. Related: Ambled; ambling.
amble (n.) Look up amble at Dictionary.com
"an easy walking gait (of a horse), the gait of a horse when both legs on one side are in motion at the same time," from Old French, from ambler (see amble (v.)). Of persons from c. 1600.