plunge

To dive, jump, or throw oneself.

To fall rapidly.

To devote oneself to or undertake an activity earnestly or wholeheartedly.

To enter or move headlong through something.

To slope steeply downward.

To move forward and downward violently.

To become suddenly lower; decrease dramatically.

To thrust or throw forcefully into a substance or place.

To cast suddenly, violently, or deeply into a given state or situation.