Synonym of diarchy: rule by two people, especially two men. / (historical) Any of several offices of the Roman Republic held by two joint magistrates known as duumvirs.

mermaidlike

(idiomatic) To address a problem, especially an unexpected one caused by the incompetence, negligence, or misconduct of another person. / Used other than figuratively or idiomatically: put out a fire.

A drop of sweat.