battle robot; war robot
Manga/anime slang for a robot designed for combat. Often used in mecha series.
あのアニメには巨大な戦闘ロボが登場する。
A giant battle robot appears in that anime.
Compound of 戦闘 (sentō, 'battle') and ロボ (robo), a clipping of ロボット (robotto, 'robot').