Definitions
1.nounA driver's field of blindness around an automobile; the side areas behind the driver.
2.nounA person's weak point.
3.nounThe space on the side of the pitch with the shorter distance between the breakdown/set piece and the touchline; compare openside.
4.nounThe blindside flanker, a position in rugby union, usually number 6."The blindside packs down at the scrum on the blindside."
5.verbTo attack (a person) on his or her blind side."The robbers crept out of the forest and blindsided the traveller."
6.verbTo catch off guard; to take by surprise."He had completed his plan to develop a new office building, but was blindsided by the sudden drop in real estate values."