[back of] or [in back of] {prep.}
1. In or at the rear of; to the back of; behind.
* /The garage is hack of the house./* /Our car was in hack of theirs at the traffic light./
2. {informal} Being a cause or reason for; causing.
* /Hard work was back of his success./* /The principal tried to find out what was back of the trouble on the bus./
3. {informal} In support or encouragement of; helping, clones will be elected because many powerful men are back of him.
* /Get in back of your team by cheering them at the game./