1. grow or progress rapidly
improve in leaps and bounds
This expression is sometimes used in reference to growth or progress made by somebody or something, it also refers to something which is quick and significant. It is often said with a sense of surprise. The variation 'by leaps and bounds' tends to be used more in the US, whereas 'in leaps and bounds' is more likely to be heard in the UK. It is common in both a social and professional context, and is similar to the phrase 'make great strides.'