heads-up

Definitions of heads-up
  1. noun
    a warning message
    “he sent a heads-up to the District Attorney”
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    type of:
    warning
    a message informing of danger
  2. adjective
    fully alert and watchful
    “played heads-up ball”
    synonyms: wide-awake
    alert, watchful
    engaged in or accustomed to close observation
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