Frege's applicability constraint holds that any adequate philosophy of mathematics must explain why arithmetic applies to empirical objects without treating numbers as mere uninterpreted symbols.

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Applicability constraint(as a demand that philosophy of mathematics must meet): A rule or requirement stating that a philosophical theory must be able to explain how and why something works in real life, not just in theory.
Arithmetic: Arithmetic is the branch of mathematics dealing with basic number operations—addition, subtraction, multiplication, and division. It's the foundation of math that you use in everyday life, like calculating change at a store, splitting a bill, or figuring out measurements. Essentially, it's the practical math skill everyone learns early in school to work with numbers in simple, straightforward ways.
Frege(as a major historical figure in philosophy): Gottlob Frege (1848-1925) was a German logician and philosopher who founded modern logic and did groundbreaking work on how language relates to meaning and existence.
Philosophy of mathematics(the field Wittgenstein is working in): The area of philosophy that asks fundamental questions about math itself: What are numbers? Do they exist in the world, or only in our minds? Are mathematical truths discovered or invented?

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