The initial idioms of the letter B

backside	backslapper
backslider	backstabber
backstairs influence	back-to-back
back-to-back-to-back	backward(s) and forward(s)
backward	backward(s) about coming forward
backward and forward	backwater
backyard	bacon
bacon-faced	bacon-fed
a bad apple	as bad as all that
bad blood	bad boy
bad break	bad bunch
bad check	bad company
bad egg	set an example
bad excuse is better than none	bad form
bad iron	bad joke