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yellow alert

noun
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Definition of yellow alert

: the preliminary stage of alert (as when hostile or unidentified aircraft are nearing a defended area) also : the signal for this — compare blue alert, red alert, white alert

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“Yellow alert.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/yellow%20alert. Accessed 4 Aug. 2020.

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