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a message informing of danger;
"a warning that still more bombs could explode"
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cautionary advice about something imminent (especially imminent danger or other unpleasantness);
"a letter of admonition about the dangers of immorality"
"the warning was to beware of surprises"
"his final word of advice was not to play with matches"
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notification of something, usually in advance;
"they gave little warning of their arrival"
"she had only had four days' warning before leaving Berlin"