出典:Wiktionary
出典:『Wiktionary』 (2025/10/09 08:20 UTC 版)
From old + hat, possibly a reference to something familiar and well-used. The Oxford English Dictionary suggests a connection to German alter Hut (“something familiar and hackneyed”, noun, literally “old hat”).
old hat (uncountable)
old hat (comparative more old hat, superlative most old hat)
From old + hat, the significance being unknown.
old hat (countable and uncountable, plural old hats) (slang, archaic)