As they watched, they saw the pink color deepen rapidly.

Thereafter, Allen rapidly deepened, and was a major hurricane only 24 hours later.

Her interest in the man was deepening rapidly and dangerously.

The storm formed on August 14 and rapidly deepened.

The sun had set and the short twilight was rapidly deepening.

Evening was rapidly deepening into night, and he had no time to waste.

It deepened rapidly, becoming a tropical storm late on September 4.

Pay strict attention to the color, which will now deepen rapidly.

He left the supplies and went down again, stumbling as the twilight deepened rapidly.

In fact, his dislike was rapidly deepening into absolute detestation.