"cross the boundaries" is correct and usable in written English.
You can use it to express the idea of going beyond established limits. For example, "She's determined to cross the boundaries of her comfort zone and try something new."
Nobody should think they can cross the boundaries of accepted behaviour and escape punishment.
But even Lewis realized the pace was beginning to cross the boundaries of reason and control.
They cross the boundaries of being soft but with clean lines in stunning colours.
At other times he has sought to cross the boundaries in order to gain power or knowledge.
The narrator wants, or part of him wants, to cross the boundaries he has drawn around his life, and this presents both moral opportunity and moral peril.
He called on western-based adherents to "strike the soldiers, patrons, and troops of the tawaghit [those who cross the boundaries set by Allah].
While it may cross the boundaries of what we consider socially acceptable, taking a secret snap of a woman on the Northern line does not break the law.
Israel will also permit more Palestinian workers and goods to cross the boundaries of the West Bank and Gaza, Israeli officials said.
Perhaps science might become one of the few ways we can cross the boundaries created by Brexit and continue working together towards a better European environment".
He also wants to show other males that he's pretty studly, that this is his territory and no one is going to cross the boundaries.
And those must cross the boundaries of Germany's 16 states, as part of one integrated system.That integration is so far missing in Germany's Energiewende.
