Pithy sayings (four well-known ones containing the circled word are the keys to unlocking this puzzle's theme)

Question:

Length:

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This puzzle's fairly obvious theme word
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Word before the first word in this puzzle's theme answers
Just making things up, or a synonym for a three-word phrase describing this puzzle's theme entries
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This puzzle's theme word
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This puzzle's key theme word
This puzzle's obvious theme word
Like this answer, or a two-word description of this puzzle's theme
Word that has two diametrically opposed meanings (like this puzzle's eight theme entries)
Theme word inside this puzzle's theme words
Classic rap outfit whose more famous members are circled in this puzzle's theme answers
Oxford American Dictionary's 2012 word of the year, and the key to this puzzle's theme
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
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Word hidden in this puzzle's theme entries
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City that's home to the jocks of this puzzle's theme, for short
"Word that can appear before the starts of A-, B- C-, D- and E-Across" crossword theme, e.g.