Straits and Zero hour

Straits noun - A difficult juncture.

Zero hour and straits are semantically related. in crisis topic. In some cases you can use "Zero hour" instead a noun "Straits".

Zero hour noun - A time or state of affairs requiring prompt or decisive action.

Straits and zero hour are semantically related. Sometimes you can replace term "Straits" with "Zero hour", this terms are similar.