Comparative form of thick; having greater width, depth, or density than something else. Can refer to physical dimensions or consistency of substances.
From Old English þicce meaning 'dense, substantial', from Proto-Germanic *theku-. The comparative form follows standard English patterns, adding -er to create comparisons.
The phrase 'thick as thieves' originally meant 'as close as thieves' - referring to the tight-knit, secretive bonds between criminals. Over time, 'thick' in this context came to mean 'intimate' or 'close-knit.'
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