Would you say 4 holes-in-one? or 4 hole-in-ones?

Question

i personally think it's 4 hole-in-ones and i've been continually arguing with my bro about it... help solve the problem lol.

Answer 1

its 4 hole in ones..

and recommend to your bro to take some English grammer lessons.

Answer 2

It would be the one you think it is. 4 hole in ones. The other way around would be you scored a one on 4 holes together. 4 holes in one shot.  

Answer 3

you're right, your brother is an idiot!

Answer 4

Yeah, i like use 4 holes-in-one....

Answer 5

It would have to be four hole-in-ones because a hole-in-one is a singular concept...it's a noun.  It's like the plural of cat is cats.