alert is a crossword puzzle answer that we have spotted 25 times. Awake Aware Watchful Vigilant Keen-eyed Observant Attentive Wide awake Bright-eyed On the ball Danger signal On one's toes Give a warning Warning message Paying attention Warning of danger Send a warning to Like good watchmen Rouse to vigilance Keep someone posted Vigilantly attentive On the lookout for danger Severe weather announcement Request of a retail website feeling the effects of an espresso shot, say