What is the difference between "on-track" and "on track"
Solution 1:
Most of the time there is a rule that governs the difference between hyphenatd (x-y) and unhyphenated (x y) use of idiomatic prepositional phrases: when they are used as adjectives preceding the noun, they are often hyphenated; when they do not precede a noun (or are used adverbially) they are not hyphenated. Example: "an over-the-counter drug" vs. "a drug I bought over the counter".