To roam about for pleasure without any definite plan.
Bertram, it is true, when he heard of the plan, rebelled, and asserted that what Billy needed was a rest, an entire rest from care and labor. In fact, what he wanted her to do, he said, was to gallivant – to gallivant all day long.
To flirt, to romance.
1809, from gallant (“wooing women”), originally in sense “to flirt”, broadened to mean “roaming without plan”.
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