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| alarm bell (alhvd) | |||
| canary in the coal mine (Ремедиос_П) | |||
| red flag (There is always a chance that unforeseeable circumstances happen, which can cause rescheduling and longer response times, but if this is happening consistently, it should be a red flag and taken with great caution moving forward. 4uzhoj) | |||
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| tendrils of fear (ad_notam) | |||
| тревожный звоночек: 2 phrases in 1 subject |
| Idiomatic | 2 |