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old hat noun

  /ˌoʊl(d) ˈhæt/ , /ˌəʊl(d) ˈhæt/
  • (idiomatic) Something regarded as very familiar and unoriginal, hackneyed, or out of date. [from early 20th c.]
 alter Hut, kalter Kaffee
to be old hat
ein alter Hut sein
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