Where does “leg extension” come from?

leg extension (English) comes from English extension, from Old French estension, from Latin extensio, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere, from Latin dis- — small stone, pebble; gravel, rubble.

leg extension (English): An exercise performed on a machine while seated....

Definitions

  1. An exercise performed on a machine while seated....

Ancestry of “leg extension”, step by step

leg extension traces back through two separate lines of ancestry.

via English extension

StepLanguageWordMeaning
1EnglishextensionThe act of extending; a stretching out;...
2Old Frenchestension
3Latinextensioextension, stretching; swelling, tumour
4Latin-tiōtion, -ation, -ing
5Latindissertātiō(spoken) dissertation, discourse, disquisition
6Latindissertusarranged, disposed; explained
7Latindissereresecond-person singular future passive indicative...
8Latindis-asunder, apart, in two; reversal, removal;...
9Latincalceusshoe
10Latincalxlimestone; chalk; the finish line
11Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English leg

StepLanguageWordMeaning
1EnglishlegA limb or appendage that an animal uses for...
2Middle Englishlegleg, limb; shank, shin; leg
3Old Norseleggrleg, stem
4Proto-Germaniclagjazleg, thigh
5Proto-Indo-European(ǝ)lak-
Every word from Ancient Greek χάλιξEvery word from Latin -tiōEvery word from Latin dis-