Etymology 1

Replaced Old English sacan by 1340 as "ground for complaint"; from querele (modern querelle), itself from querella "complaint", from queri "to complain, lament"

Noun

1. A verbal dispute or heated argument.

   Quarrels would not last long if the fault were only on one side - François de La Rochefoucauld

2. A ground of dispute; a complaint

Verb

1. To disagree
2. To contend, argue strongly, squabble.
3. To find fault
4. To complain bitterly.

Etymology 2

From as "square-headed bolt for a crossbow" c.1225, from quarel (also quarrel or carreau; modern: querelle), from *quadrellus, the diminutive of quadrus "a square", related to quattuor "four".

Noun

1. A diamond-shaped piece of coloured glass forming part of a stained glass window.
2. A square tile; quarry tile
3. A square-headed arrow for a crossbow.