The initial idioms of the letter B

by the	by the back door
by the board	by the book
by the by	by the bye
by the day	by the dozen
by the dozens	by the end of the day
by the grace of God	by the handful
by the hour	by the month
by the name	by the nape of the neck
by the numbers	by the same token
by the scruff of (one's)/its/the neck	by the seat of (one's) pants
by the seat of pants	seat of the pants, by the
by the short hairs	by the skin of (one's) teeth
by the skin of one's teeth	by the skin of teeth
by the sweat of brow	by the sweat of one's brow
by the thousand	by the thousands