expression, noun
outnumbered; overwhelmed by numbers
A set phrase meaning that a smaller force cannot win against a much larger one. Often used in military, sports, or competitive contexts, but also in everyday situations where one side is heavily outnumbered.
多勢に無勢で、結局彼らは負けてしまった。
Outnumbered, they ended up losing.
多勢に無勢で
There's no chance of winning when you're outnumbered.