Quine's indeterminacy of translation thesis shows that no fact of the matter fixes synonymy relations between expressions, even in principle, undermining any naturalistic grounding.

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Fact of the matter(whether there is a definitive fact determining correct interpretation): An objective truth that exists independently—something that is actually the case, rather than a matter of opinion or interpretation.
Naturalistic(describing the type of moral facts being discussed): Based on the natural world and what science can observe and measure, rather than on supernatural or non-physical things.
Quine(as a proper name referring to the philosopher whose theory is being discussed): Willard Van Orman Quine was a 20th-century American philosopher who wrote about how we know things and how language works. In this statement, we're discussing one of his specific ideas about observation.
grounding(Drawn from contemporary metaphysics; proposed as potentially applicable to understanding the foundations of legality.): A metaphysical relation in which some entities or facts are more foundational than others, providing a hierarchical structure of the world.
indeterminacy of translation(philosophy of language, opposed to Collingwood's re-enactment thesis): Quine's claim that it is not possible to achieve determinacy in translation
synonymy(Church's assumption underlying the Church Translation Argument (CTA)): An equivalence relation that is reflexive, symmetric, and transitive.

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