boss (noun) — sense 3

A lump, protuberance, or swelling in an animal, person or object.: A protrusion; frequently a cylinder of material that extends beyond a hole.

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Example
To the upper part of the frame a chain is attached, and if the screw shaft be drawn back out of the boss, the square frame may be hove up by carrying the chain to a winch—the sliding block maintaining the frame in the perpendicular position.
Order number
3
Part of speech
noun

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