出典:Wiktionary
From Middle English cok crowe (also as cokkes crowe), equivalent to cock + crow. Likely a suppletive variation of 古期英語 hancrǣd (“cockcrow, dawn”, literally “cock-crowing”), from hana (“cock, rooster”) + crǣd (“crowing”).
cockcrow (countable かつ uncountable, 複数形 cockcrows)