what does "Make up of" mean?

I can’t find the phrase “Make up of” in my dictionary. So exactly, what does “make up of” mean ?
Concretely, I don’t understand these following sentences. May you explain them to me ?

“…the outer layer of the Earth is made up of plates that are continually moving…”
“It’s converted into an analog signal that’s made up of electronic impulses”


Thank you.

It’s an idiom meaning ‘consisting of, constructed from, or containing’.

Hi Jack Sparrow,

I think the idiom " make up of" meaning: “create by, make up, constitute, compose of, form”

The verb would be “make up”, but the noun here should be “make-up”, considering that “makeup” is something people use to decorate their faces.

If it’s an adjective it’s the same: make-up.

The teams played a makeup game = The teams applied mascara, eye-shadow, lipstick (etc.) to each other.

The teams played a make-up game = The teams made up a game which was supposed to have been played on an earlier date but which was cancelled due to some unforseen circumstance (bad weather, a fight between the teams, etc.).

That’s what I think about it anyway.

Makeup (noun/adjective) = mascara, lipstick, etc.
Make-up (noun/adjective) = Scheduled for the past but played today.
Make up (verb)

Or have I got makeup and make-up switched? I figure I’m at least right in either hyphenating or combining them to form nouns and adjectives and, as such, can say that the phrase listed in the first post should be “makeup of” or “make-up of”.

Ugh.

  • The make-up game was scheduled for tomorrow.