Poll: I couldn't make head ____ tail of it.

Secsee Devil

Pretty sure you could use both yeah?

sara

or

Stoilka

it's definitely OR! Make Head or tail of something is to be able to understand it

Linda

I've only seen or heard it as plural: I couldn't make headS or tailS of it.

ClaretEverywhere

You should really use 'nor', because it's negative, i.e. "neither one nor the other", as opposed to "either one or the other".

jom

it should be "nor" - because the sentence is negative.

Thom

Quite the opposite, it should be "Heads OR Tails" instead of NOR because "I couldn't make heads nor tails" would be a double negative.

Grahm

Grammatically, it would be "head nor tail", as in "I could make neither head nor tail of it." However, the idiom is "head or tail", `and should not be manipulated based on context. So "I couldn't make head or tail of it" is correct.

Banana

Ok yeah it can be both but nor seems to make more sense to me