Where does “sicklebird” come from?

sicklebird (English) comes from English sickle, from Middle English sikel, from Old English sicol, from Proto-Germanic *sikilu, from Latin secula, from Latin secō, from Proto-Indo-European sek- — to cut, cut off, sever.

Ancestry of “sicklebird”, step by step

sicklebird traces back through two separate lines of ancestry.

via English sickle

StepLanguageWordMeaning
1EnglishsickleAn implement having a semicircular blade and...
2Middle EnglishsikelA sickle tool for reaping grain
3Old Englishsicolsickle
4Proto-Germanic*sikilu
5Latinseculaa sickle; nominative plural of sēculum;...
6Latinsecōto cut, cut off
7Proto-Indo-Europeansek-to cut, cut off, sever

via English bird

StepLanguageWordMeaning
1EnglishbirdA member of the class of animals Aves in the...
2Middle Englishbrida young bird, a bird in general; Alternative form...
3Old Englishbriddyoung bird, chick; chicken
Every word from Proto-Indo-European sek-