This is the 15132nd most frequent German word.
streiten
To argue or fight.
In this imperative form, 'streiten' is used to describe an action to avoid, urging cooperation instead.
Lass uns nicht streiten, sondern eine Lösung finden.
Let's not argue but find a solution.
The word 'streiten' in this sentence is used reflexively to describe mutual arguing between the siblings.
Die Geschwister streiten sich oft über Kleinigkeiten.
The siblings often argue about small matters.
Here, 'streiten' is used reflexively with 'ab' as a separable prefix, 'abstreiten,' to mean denying something.