We found one dictionary that defines the word mock'st:

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1. mock'st: Wiktionary

Definitions from Wiktionary (Mock'st) ▸ verb:  Obsolete form of mockest. ▸ Words similar to mock'st ▸ Usage examples for mock'st ▸ Idioms related to mock'st ▸ Wikipedia articles (New!) ▸ Words that often appear near mock'st ▸ Rhymes of mock'st ▸ Invented words related to mock'st