Any of various types of knife that are designed as weapons and sold or marketed as military issue; specifically a dagger-like knife with a long, thin, double-edged blade and a sharply pointed tip.
Origin
1940s; earliest use found in The Times.
Definition of combat knife in US English:
combat knife
noun
Any of various types of knife that are designed as weapons and sold or marketed as military issue; specifically a dagger-like knife with a long, thin, double-edged blade and a sharply pointed tip.