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The phrase 'knock at' is correct and usable in written English.
You can use it when you mean to make a noise to attract attention, usually at a door or window. For example: He knocked at the door and waited for someone to answer.
Exact(54)
We can only knock at it.
There was a knock at our door.
There's a knock at the door.
There was a knock at the door.
There is a knock at the door.
There was a knock at the window.
Similar(6)
Context: Double-knock at approximately 10 seconds into the clip.
"They kept knocking at it.
We're still knocking at the door.
Who is knocking at your door?
The wolf's knocking at the door".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com