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Definition of Old hat
1. Noun. (idiomatic) Something with which one is very familiar, or in which one is experienced or skilled. ¹
2. Noun. (idiomatic) Something widely or long practiced, known, or accepted; something conventional. ¹
3. Noun. (idiomatic) Something uninteresting, hackneyed, or passé due to overuse or long-standing familiarity. ¹
¹ Source: wiktionary.com