■ verb
1》 inform of a possible danger, problem, etc.
↘( ~ someone off ) order someone to keep away or to refrain from doing (something).
2》 give cautionary advice about actions or conduct to.
Derivatives
~er noun
Origin
OE war(e)nian , wearnian , from a W. Gmc base meaning 'be cautious'; cf. ware 3 .