on guard

His guidance underlines that not only must lawyers remain responsible for the evidence they put before a court, but judges must be also on guard against biased results from AI tools trained on partial data.

The weather service is urging residents to be on guard for fast-spreading blazes, power outages and downed trees.

He’s also more on guard about masking when there’s an uptick in COVID, as there is now nationally.

Officers spend their shifts with their heads on a swivel, she said, ever on guard in case a fight breaks out or they’re attacked.

Not too close, though, The corridor leading to 5A has been cordoned off and a masked police officer is on guard to make sure we don’t get any nearer.