The price of rice is increasing ____ .

By (or in) leaps and bounds:   
English Meaning: with startlingly rapid progress.
Bangla Meaning: দ্রুতগতিতে।   
Ex. Sentence: Population is increasing by leaps and bounds.
Bangla Meaning: জনসংখ্যা দ্রুতগতিতে বৃদ্ধি পাচ্ছে।

Source: lecture.