The initial idioms of the letter B

by heart	by hell or high water
by herself	by hook or by crook
by hook or crook	by itself
by leaps and bounds	by main strength and awkwardness
by means of	by mistake
by myself	by nature
by day	night and day
by no means	by no stretch
by no stretch of the imagination	by numbers
by one's bootstraps	by one's wits
by oneself	by ourselves
by reason of	by request
by return mail and by return post	by rights
by rote	by shank's mare
by stealth	take by storm