Welsh

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Verb

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eistedd i fyny (first-person singular present eisteddaf i fyny)

  1. to sit up[1]
  2. (idiomatic) to stay up (not go to bed)[1]
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References

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  1. 1.0 1.1 R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “eisteddaf”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies