1. to become firm, to tighten (This is a relatively small family with the only notable English member being "tight". "thick" would fit in as well, but that comes from a different root, actually. )
Meanings
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Word Family
Root: *tenk-
The core idea of the root was
becoming firm, thickening, contracting
The only known English offspring is tight. Thick does NOT belong to this family, though it would make sense if it did.