On high ___ (very vigilant)

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Possible Answers:

Alert.

Last seen on: Daily Celebrity Crossword – 5/16/19 Top 40 Thursday

Random information on the term “Alert”:

Alharod (Persian: الهرد‎, also Romanized as Eleherd, Alhard, and Elehred; also known as Alard, Alert, Alīrd, Alīrī, and Alirt) is a village in Sina Rural District, in the Central District of Varzaqan County, East Azerbaijan Province, Iran. At the 2006 census, its population was 121, in 24 families.

Alert on Wikipedia