Definitions for "AMBIDEXTROUS"
Able to pick with equal skill a right-hand pocket or a left.
Having the faculty of using both hands with equal ease.
the ability to perform on both the right and left sides.
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another; "she was a deceitful scheming little thing"- Israel Zangwill; "a double-dealing double agent"; "a double-faced infernal traitor and schemer"- W.M.Thackeray
Keywords:  practicing, parties, siding
Practicing or siding with both parties.