ˌmake-or-ˈbreak adjective
something that is make-or-break will lead to either success or failure:
This could be a make-or-break speech for the prime minister.

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make or break
make or break (something)
to cause something to succeed or fail.
His opinion could make or break a Broadway play.

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make or break something
make or break (something)
to cause something to succeed or fail.
His opinion could make or break a Broadway play.

[TahlilGaran] English Idioms Dictionary ▲

make-or-break
make or break (something) - to make something a success or a failure.
It's make-or-break time for Britain's tennis players.
(always before noun)

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make or break
either benefit or ruin someone
The new business venture will probably make or break my uncle.

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make or break
v. phr. To bring complete success or failure, victory or defeat.
Playing the role of Hamlet will make or break the young actor.

[TahlilGaran] English Idioms Dictionary ▲