Definition of warning adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈwɔːnɪŋ//
; NAmE NAmE//ˈwɔːrnɪŋ//
[only before noun]
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telling or showing somebody that something bad or unpleasant may happen in the future so that they can try to avoid it She had ignored the warning signs of trouble ahead. Police fired a number of warning shots. Warning bells began to ring (= it was a sign that something was wrong) when her letters were returned unopened.