On the/full/red alert
Meaning: on guard, to be expecting problems and ready to deal with them
Example: He’s cautious and always on the alert. Police in the region were on full alert against further attacks.
Π‘Π΅ΡΠΈΠ°Π»Ρ ΠΈ ΡΠΈΠ»ΡΠΌΡ Π½Π° Π°Π½Π³Π»ΠΈΠΉΡΠΊΠΎΠΌ Ρ ΡΡΠ±ΡΠΈΡΡΠ°ΠΌΠΈ. +1 ΠΠ΅ΡΡΡ Π² ΠΏΠΎΠ΄Π°ΡΠΎΠΊ π
Example: He’s cautious and always on the alert. Police in the region were on full alert against further attacks.