To change from one state, condition, or direction to another; to alter, shift about, give way.

figurative. To stray, wander in purpose.

Of a person: To shift about in mind; to waver. Obsolete.

to play fast and loose (also to play at fast and loose and variants): to be inconstant or inconsistent, esp. regarding one's obligations to others…

intransitive. To change from one (esp. romantic) attachment to another; to change affections, to be inconstant. Obsolete.

To be inconsistent in one's statements; to introduce a difference or discrepancy.

intr. To render half service or obedience.

to blow hot and cold: (figurative) to be or to do one thing at one time, another at another; to be inconsistent or vacillating. (In reference to…

figurative. To flit inconstantly from one object to another. Obsolete.

intransitive. To beat to windward; to tack.

intr. to weathercock it: to veer or vary like a weathercock. Obsolete.