By leaps and bounds
Rapidly, by large movements forward. The construction of the new airport is progressing by leaps and bounds.
By hook or by crook
In any way necessary. My sister wants to go to Italy next year by hook or by crook.
By heart
By memorizing. The boy knows the poem by heart.
By fits and starts
Irregularly, with many stops and starts. By fits and starts the company was able to begin business.
By far
Greatly, by a great margin. The man is by far the smartest person in his company.
By chance
Without planning. By chance, I saw my father's friend in the supermarket.
By any means
By any way possible. We need to find a computer by any means.
By and large
Generally, on the whole. By and large, we had a good meeting even though it was very short.
By and by
Before long, after some time has passed. By and by, all of the family moved back to the city.
By all means
Certainly, yes. By all means, I will come to dinner next week.