The phrase "a constant alert" is correct and usable in written English.
It can be used to describe a state of being continuously vigilant or watchful, often in contexts related to safety, security, or awareness.
Example: "In high-risk environments, maintaining a constant alert is crucial to ensure everyone's safety."
Alternatives: "a state of vigilance" or "continuous awareness".
In the bottom of the seventh, the bottom-line scoreboard was replaced by a constant alert (total elapsed time: 32 minutes 17 seconds) that the ESPYs were "Coming Up Next".
I have yet to tie myself to a tree trunk, but I must be on a constant alert for the dreaded sound of the chain saw and then determine if it is a street tree being attacked.
Because all analyses were conducted at a constant alert rate of 1%, improvements in sensitivity were not accompanied by an increase in alerts.
At a constant alert rate of 1%, sensitivity was improved for both datasets by using a minimum standard deviation (SD) of 1.0, a 14 28 day baseline duration for calculating mean and SD, and an adjustment for total clinic visits as a surrogate denominator.
The base was in a state of constant alert.
Many entrances to Sadr City remain sealed off by United States troops, while Sadrist fighters are guarding street corners inside a cordon, on constant alert for further American raids.
And yet, to a government on constant alert to security threats, there may have been much in the meeting that Regeni attended – and in the article he wrote about it – that the government would have found alarming.
The Zaccaria are reported to have maintained a thousand infantry, a hundred horseman and a couple of galleys on constant alert.
Through brief encounters and troubling retellings of recent news, Rankine puts one, as a white reader, on constant alert for any unconscious racism in oneself.
This wariness lurks beneath a sensibility that's on constant alert for crazy, sensual, often ravaged beauty.
Watching TV, theatre or film, I'm on constant alert for a glimpse of someone who looks Chinese, for the slightest resemblance to an estimated 499,999 others like me living in the UK.
