This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. Third-person singular simple present indicative form of deepen.

"The titular dilemma deepens throughout-with minimal change in cadence, slang, or vocabulary-the group's conversational flow slowly morphing into a kind of stoned, post-structuralist Marx Brothers routine."

shoal   

deepened    deepening    deepens   

enlarge    change   

darken    strengthen    intensify   

cheapen