go so far as to

go as far as to (do something)

To do something extreme, risky, or controversial. Often used in the negative. Although I wouldn't go as far as to call him a coward, he definitely likes to avoid confrontation when he can. They went as far as to threaten us with legal action if we didn't delete the video in question.
See also: far, go

go so far as to (do something)

To do something extreme, risky, or controversial. Often used in the negative. Although I wouldn't go so far as to call him a coward, he definitely likes to avoid confrontation when he can. They went so far as to threaten us with legal action if we didn't delete the video in question.
See also: far, go
Farlex Dictionary of Idioms.

go so far as to

Also, go as far as to. Proceed to the point of doing something. For example, I wouldn't go so far as to call him incompetent, but he does need supervision, or Would she go as far as to sell the house before she's found another?
See also: far, go
The American Heritage® Dictionary of Idioms by Christine Ammer.

go as/so far as to do something

be willing to go to extreme or surprising limits in dealing with something: She’s a brilliant painter, but I wouldn’t go so far as to say she is the best in the country. I don’t like people smoking but I wouldn’t go so far as to forbid it.
See also: far, go, something
Farlex Partner Idioms Dictionary
See also:
  • go so far as to (do something)
  • go as far as to (do something)
  • go as/so far as to do something
  • go so far as (doing something)
  • go as far as (doing something)
  • go so far as to say
  • go so far as to say (something)
  • take a gamble
  • ride a tiger
  • wussy
References in periodicals archive
They explain, "What interests us in operations of striation and smoothing are precisely the passages or combinations: how the forces at work within space continually striate it, and how in the course of its striation it develops other forces and emits new smooth spaces." Deleuze and Guattari go so far as to suggest that smooth space is not preferable in and of itself.
Crossing Western space, or the HooDoo detective on the boundary in Ishmael Reed's Mumbo Jumbo