One of the mysteries of the English language finally explained.
1A section that attaches to or fits inside a leg of an object allowing it to extend to a desired length.
2An act or the action of straightening (and typically raising) one's leg or legs; (now especially) an exercise performed seated on an exercise machine with a weighted bar that the shins hook under, lift, and slowly lower.
Mid 19th century; earliest use found in American Artisan.
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