spearfish noun 3verb 2forms 3 noun3 •Any of the genus Tetrapturus of marlins, a type of fish with the upper jaw elongated into a spearlike bill. •Any striped marlin (Kajikia audax) •Any quillback Carpioides cyprinus verb2 •To attempt to catch a fish using a spear or spear gun.Bart, who incidentally has designed an excellent diaphragm‐type call for geese and turkeys, once spearfished commercially in the British West Indies. — 1979 •To fish for spearfish by any method. formsspearfished · spearfishing · spearfishes