What does "blindside" mean?

A driver's field of blindness around an automobile; the side areas behind the driver.

What is a synonym for "blindside"?

Common synonyms include: blind spot, blind spot.

Pronounced //ˈblaɪndˌsaɪd//.

//ˈblaɪndˌsaɪd// noun, verb, slang

noun, verb, slang ·Moderate ·College level

Noun

1
A driver's field of blindness around an automobile; the side areas behind the driver.
2
A tram/train driver's field of blindness around a tram (trolley/streetcar) or a train; the side areas behind the tram/train driver.
3
A person's weak point. figuratively
4
The space on the side of the pitch with the shorter distance between the breakdown/set piece and the touchline; compare openside.
"Showing no ill-effects from her lay-off, the full-back had already beaten three defenders on a jagging kick return, when she was sprung down the blindside a minute later."
5
The blindside flanker, a position in rugby union, usually number 6.
"The blindside packs down at the scrum on the blindside."

Verb

1
To attack (a person) on his or her blind side. transitive
"The robbers crept out of the forest and blindsided the traveller."
2
attack or hit on or from the side where the attacked person's view is obstructed wordnet
3
To catch off guard; to take by surprise. figuratively, informal, transitive
"He had completed his plan to develop a new office building, but was blindsided by the sudden drop in real estate values."
4
catch unawares, especially with harmful consequences wordnet