Where does “jump cushion” come from?

jump cushion (English) comes from English cushion, from Middle English quysshyn, from Old French coissin, from Latin coxinum, from Latin coxa, from Proto-Indo-European koḱs- — joint.

jump cushion (English): A large (sometimes inflatable) cushion used to catch a person falling from a great height, chiefly used in sports or for emergency rescue

Definitions

  1. A large (sometimes inflatable) cushion used to catch a person falling from a great height, chiefly used in sports or for emergency rescue

Ancestry of “jump cushion”, step by step

jump cushion traces back through two separate lines of ancestry.

via English cushion

StepLanguageWordMeaning
1EnglishcushionA soft mass of material stuffed into a cloth bag,...
2Middle EnglishquysshynA soft stuffed bag; a cushion or pillow
3Old Frenchcoissincushion
4Latincoxinum—
5Latincoxahip (joint), hipbone
6Proto-Indo-Europeankoḱs-joint

via English jump

StepLanguageWordMeaning
1EnglishjumpTo propel oneself rapidly upward, downward and/or...
2Arabicجَنْب—
Every word from Proto-Indo-European koḱs- →Every word from Latin coxa →Every word from Latin coxinum →