warning sign
US /ˈwɔːr.nɪŋ ˌsaɪn/
UK /ˈwɔːr.nɪŋ ˌsaɪn/
1.
a sign that gives a warning
:
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The yellow light is a warning sign that the traffic light is about to turn red.
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There was a warning sign about falling rocks on the mountain road.
2.
an event or circumstance that indicates a possible problem or danger
:
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His constant lateness was a warning sign that he was losing interest in the job.
•
Early symptoms can be a warning sign of a more serious illness.