Definition of thick noun from the Oxford Advanced American Dictionary

 

thick

 noun
noun
NAmE//θɪk//
 
[uncountable]
 
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Idioms
in the thick of something
 
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involved in the busiest or most active part of something As a player, he's always in the thick of the action. Her comments landed her in the thick of a family feud.
through thick and thin
 
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even when there are problems or difficulties He's supported the team for over ten years through thick and thin. In marriage, you have to stick together through thick and thin.
See the Oxford Advanced Learner's Dictionary entry: thick