Should Windup Be Hyphenated?

The phrase wind-up (and wind up, as two separate words with no hyphen) exists with two pronunciations, and two meanings. These derive from the two main meanings you can see at Wind (disambiguation). The first group of words are all derived from the verb 'to wind (pronounced /waɪnd/ W-EYE-ND).

Is windup one word?

Noun the windup of the negotiations He went into the windup, then threw the pitch.

Is it windup or wind up?

wind up: ... to become ultimately:to wind up as a country schoolteacher. Sport[Baseball.] (of a pitcher) to execute a windup.