Select the most appropriate meaning of the given idiom.
By leaps and bounds

The correct answer is Rapidly.

Explanation:
The idiom "by leaps and bounds" is used to describe something that is progressing, growing, or changing very quickly, rapidly, or by large amounts at a time.

Example in a sentence:
"The company's profits have grown by leaps and bounds over the past year."

Analysis of Options:
- Unknowingly: Refers to doing something without awareness or knowledge.
- Normally: Refers to doing something in a customary or usual manner.
- Slowly: Refers to moving or progressing at a low speed, which is the antonym of the given idiom.
- Rapidly: Means happening at a fast rate or speed, which correctly conveys the meaning of "by leaps and bounds".