Question

make one open or hyphenated compound from under​

Answer 1

When two words come together to create a single new idea that expresses meaning different from that of either of the individual words, the result is a compound word.

Sometimes compound words include hyphens (not to be confused with em dashes or en dashes, which we also discuss on this site).

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Answer 2

Open compound word from under = under way

Hyphenated compound word =  under-skilled.