A clash or disagreement, often violent, between two or more opposing groups or individuals.
An incompatibility, as of two things that cannot be simultaneously fulfilled.
To overlap (with), as in a schedule.
To be at odds (with); to disagree or be incompatible
Rough activity; fighting or brawling; a fight.
An environment of rough activity
A person who characteristically engages in such activity
Engage in rough-and-tumble activity
active, vigorous and rough, with the possibility of harm
highly competitive