- (intransitive) To roam about for pleasure without any definite plan.
"1914 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. – Eleanor H.Porter Miss Billy – Married, Chapter 18."
- (intransitive, obsolete) To flirt, to romance.