Meaning of 間合いを外す


In the context of two opponents facing off each other. Does it mean reducing
or increasing the distance between the two? Something else?




It would mean "to increase the distance" to use your own words.

「[間合]{まあ}いを[外]{はず}す」 means "to sidestep", "to dodge", etc. in the one-on-one
type of sports and martial arts.

Your exact context is unknown, but the phrase could not possibly mean the
opposite.




It would mean "to increase the distance" to use your own words.

「[間合]{まあ}いを[外]{はず}す」 means "to sidestep", "to dodge", etc. in the one-on-one
type of sports and martial arts.

Your exact context is unknown, but the phrase could not possibly mean the
opposite.

