Literally, it means bending oneself so that one touches the ground behind one while still standing on one's feet. It's something you see contortionists do. Figuratively (and one most often sees the figurative form) it means to go well beyond the normal in order to accommodate or please someone. If John Candy was staying at a hotel and the hotel flew one of its employees to Winnipeg to get pyrogies because John Candy liked to eat pyrogies from Winnipeg, that would be bending over backwards.
to make exceptional efforts to do something
It means you will do a lot to help someone.
You will do whatever it takes to get something done or to please someone. You will literally bend over backwards if that is what it takes.
Over there.
Over a Barrel: helpless, at a disadvantage
"Head over heels in love" would be one idiom.
I believe you mean "hand over fist." It means that money and merchandise are being exchanged very rapidly.
It's not really an idiom. It's something you say when someone is either talking too rapidly and you want them to slow down, or they are getting too excited over something.
"Bent over backward" is an idiom that means to make a great effort to accommodate or please someone. It suggests going to extreme lengths or making significant sacrifices to help others or achieve a goal.
Over there.
This is not an idiom. "It's over" means that it is over, or finished, or done. Whatever "it" refers to has concluded.
Over a Barrel: helpless, at a disadvantage
Typically, "bent" is used as an insult as in "get bent." The phrase "get bent" means "get bent over," in other words, "screw you."
leftovers
It's not an idiom because it means just what it seems to mean. You should stay on the side of the fence that you are currently on and not climb over.
Murderous, hispanic teenage mother of 3. Kearns, UT - September 5, 2008 -Bent her 2 yr old son backwards over her knee, fatally snapping his spine.
I don't know what you mean by "common phrases of," but the idiom "over and above" just means "more than what was agreed upon."
sit down come over to
This isn't an idiom because you can figure it out if you look up the word "pins." It is a SLANG term meaning legs, so you knocked him over.
In a difficult situation that causes people to be worried and upset over something or someone