be on firm ground

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be on firm ground

To be certain of or comfortable with something. Anna can tutor you—she's on firm ground with diagramming sentences.
See also: firm, ground, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be on firm ground

be sure of your facts or secure in your position, especially in a discussion.
See also: firm, ground, on
Farlex Partner Idioms Dictionary © Farlex 2017

be on firm ˈground

be sure about your beliefs, knowledge, etc.; be confident: I don’t know a lot about physics, I’m afraid. I’m on firmer ground with mathematics, which I studied at university.
See also: firm, ground, on
Farlex Partner Idioms Dictionary © Farlex 2017
See also: