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Discover LudwigThe phrase "I'm rock solid" is grammatically correct and can be used in written English.
It is an idiomatic expression that means someone is very strong, steady, and dependable. Example: "Don't worry about the project, I'll take care of it. I'm rock solid when it comes to meeting deadlines."
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Even when constructing simple, informal menus, it's wise to have some ready repertory of accompaniments, and I'm rock-solid here.
And it is rock solid correct as "I'm going to school".
"The slope is awesome and it's rock solid underneath.
I have to be rock solid and I can tell you I won't be buckling, and the players have to take strength from me".
While chomping them down, I discovered one that was rock solid: not a chip, but a small bone.
I do have a desire to be rock solid and do everything I can to create jobs in the state of Wisconsin.
"I'm sure he's going to be rock solid in Paris again".
The few calls I've made on the Nexus S were rock solid.
Our magazine is rock solid".
The Beethoven was rock solid.
@mike_pence is rock solid".
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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