posted
However, if it is a heads-up display let's say, on a weapons system, then you may have heads-up'sPosts: 1683 | Registered: Aug 2004
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Contraction uses an apostrophe: dragon+is=dragon's The dragon's flying this direction.
Possessive uses an apostrophe: dragon+possession=dragon's The dragon's scales are hard as nails.
Plural NEVER uses an apostrophe. Never EVER. Don't Even Think It... 1 dragon + 1 dragon = 2 dragons The dragons are getting pretty rambunctious in these parts.
...unless the plural is a plural form of lower case letters, like "Mind your p's and q's." But the plural form of any normal noun? Sans apostrophe, please.
posted
Are we going to have to thunk Mr. Writing Person on the noggin?
In a classroom, you have a virtual plethora of pencils. Multiple pencils = plural, ie: Pencils down. (Whole lotta pencils going down.) Pencil's down would be one pencil is going down.
posted
In reference to your original question, I've found a few references to "heads-up". Apparently, this form has been added to Webster's College Dictionary as both an adjective and a noun. (Seems it's been an adjective for a long time.)
I'd think the phrase "Heads up!" would be correct without the hyphen, but that's just my opinion.