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be on alert

VERB
watch
Synonyms
STRONGEST
attend guard protect take care of wait
STRONG
mind oversee patrol police superintend tend watch over
WEAK
be on the lookout be vigilant be wary be watchful care for keep an eye on keep eyes open keep eyes peeled keep watch over look after look out pick up on ride shotgun for take heed
Antonyms
STRONGEST
ignore neglect
WEAK
harm hurt overlook pass by

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.

While the bank is expected to stand pat next week, policymakers will be on alert for signs that higher energy costs are leading to bigger wage demands and increased prices for other goods and services.

From The Wall Street Journal • Apr. 22, 2026

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

From Barron's • Nov. 18, 2025

She tells her 18-year-old daughter to be on alert when she goes out.

From Los Angeles Times • Jul. 5, 2025

"Be careful, the enemy is losing in every direction," he added, telling them that this meant they were more likely to be on alert for infiltrators and spies.

From BBC • Dec. 19, 2024

Lately, I felt like I always had to be on alert for the next raccoon invasion.

From "Crenshaw" by Katherine Applegate