(idiomatic) suspenseful, involving alternating roles of attack and defence.

Alternative form of cat and mouse

(intransitive) To mutually monitor and challenge each other in an attempt to gain advantage. / (transitive) To toy with (one's victim).

(obsolete) Having a projecting under jaw; prognathous.

A mountainous region of New South Wales, Australia. / A small mountain range on Ellesmere Island, Nunavut, Canada.

plural of mountain unit

An aphthous ulcer; an open sore in the mouth, or rarely a break in the mucous membrane or the epithelium on the lips or surrounding the mouth.

A difficult challenge.

Alternative form of birdsmouth.

Huperzia appalachiana.