Traders braced themselves for the triple witching hour, when volume and volatility often spike as three types of derivatives contracts expire simultaneously.

The technician inspected the old watt-hour meter before replacing it with a digital model.

The IT support team monitors the servers twenty-four hours a day to prevent downtime.

When everything seemed lost, she reminded herself that the darkest hour is just before the dawn and kept going.

When morale was low, their mentor reminded the class of the proverb the darkest hour is always just before the dawn to encourage everyone to persevere.