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