be on alert

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Gardeners and growers across the northern half of the UK will then need to be on alert on Saturday night as a frost is possible.

From BBC • May 9, 2026

The IMF chief said regulators should be on alert for any signs of instability in the financial system as a consequence of the conflict.

From The Wall Street Journal • Apr. 9, 2026

Anyone playing in the already-volatile small-cap arena should be on alert to avoid getting burned.

From Barron's • Nov. 18, 2025

“We had to be on alert and I had to formulate the response,” Petit said.

From Seattle Times • Mar. 10, 2024

Whether or not a human knew what they were, an instinct inside them knew to be on alert, to be just a little afraid.

From "Night Owls" by A.R. Vishny