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
Bitter conflict, sometimes violent.
A trouble of any kind.
Striving; earnest endeavor; hard work.
Exertion or contention for superiority, either by physical or intellectual means.