Niku-Usu-Sen (肉薄戦) is a Japanese term often used in contexts relating to combat or strategy.

- Niku (肉) – Literally means "flesh" or "meat."
- Usu (薄) – Means "thin" or "close."
- Sen (戦) – Means "battle" or "war."

Together, Niku-Usu-Sen can be interpreted as a "close combat" or "close-quarters battle," where opponents engage in a direct and intimate form of fighting. It is typically used in military or martial arts contexts to describe a scenario where physical proximity and direct confrontation are key.

In modern contexts, it can also be metaphorically applied to intense competition or struggles in non-military fields, emphasizing the closeness and intensity of the contest.