ask someone out

[sunsunmoon]

Merriam-Webster's Learner's Dictionary
◊To ask someone out is to ask someone to go on a date with you.
▪ I asked her out (on a date), but she turned me down.

What would Americans use this phrase to mean "to invite someone to go outside to fight"?

[billmcd]

Merriam-Webster's Learner's Dictionary
◊To ask someone out is to ask someone to go on a date with you.
▪ I asked her out (on a date), but she turned me down.

What would Americans use this phrase to mean "to invite someone to go outside to fight"?

Never heard/read the expression used that way especially with the word "ask". Although for a confrontation of that type you might hear, "Let's step/go outside and we'll settle this".