Where does “cross-sibling” come from?

cross-sibling (English) comes from English cross-, from Irish cros-, from Irish cros, from Old Irish cros, from Latin crux, from Proto-Italic *kruks, from Proto-Indo-European sḱer- — to caw, crow.

cross-sibling (English): An opposite-sex sibling or parallel cousin

Definitions

  1. An opposite-sex sibling or parallel cousin

Ancestry of “cross-sibling”, step by step

StepLanguageWordMeaning
1Englishcross-exchange; switch; across; Indicating...
2Irishcros-cross-
3Irishcroscross; crosspiece; trial, affliction
4Old Irishcroscross
5Latincruxwooden frame on which criminals were crucified,...
6Proto-Italic*kruks—
7Proto-Indo-Europeansḱer-to caw, crow
Every word from Proto-Indo-European sḱer- →Every word from Proto-Italic *kruks →Every word from Latin crux →