What this suffix does
-knit forms compound adjectives that describe how closely or loosely a group, community, or structure is held together. Close-knit, tight-knit, loosely-knit, well-knit — each compound uses the metaphor of knitting to describe cohesion: the degree to which individual threads (people, elements) are interwoven into a fabric (community, structure). "Close-knit" and "tight-knit" have become among the most common descriptors for communities in English, carrying the warm associations of the hand-knitted textile: intimate, strong, mutually dependent, produced by repeated acts of connection.