leaps and bounds in leaps and bounds/by leaps and bounds
or in leaps and bounds/by leaps and bounds
phraseYou can use in leaps and bounds or by leaps and bounds to emphasize that someone or something is improving or increasing quickly and greatly.
[emphasis] He's improved in leaps and bounds this season.
The total number of species on the planet appears to be growing by leaps and bounds.
See full dictionary entry for leap