back out
— Verb
– English
~ move out of a space backwards; "He backed out of the driveway"
bang out
— Verb
– English
~ play loudly; "They banged out `The star-spangled banner'"
back out
— Verb
– English
~ make a retreat from an earlier commitment or activity; "We'll have to crawfish out from meeting with him"; "He backed out of his earlier promise"; "The aggressive investment company pulled in its horns"