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See also: Appendix:Variations of "dat"

Old Irish

Pronunciation

Prefix

dat- (class B & C infixed pronoun, triggers lenition)

  1. alternative form of dot- (“thee, you (singular object pronoun)”)

See also

Old Irish affixed pronouns
See Appendix:Old Irish affixed pronouns for details on how these forms are used.
Note that the so-called “infixed” pronouns are technically prefixes, but they are never the first prefix in a verbal complex.
person infixed suffixed
class A class B class C
1 sg m-L dom-L, dam-L -um
2 sg t-L dot-L, dat-L, dut-L, dit-L -ut
3 sg m a-N, e-N d-N id-N, did-N, d-N -i, -it
3 sg f s-(N) da- -us
3 sg n a-L, e-L d-L id-L, did-L, d-L -i, -it
1 pl n- don-, dun-, dan- -unn
2 pl b- dob-, dub-, dab- -uib
3 pl s-(N) da- -us

L means this form triggers lenition.
N means this form triggers nasalization (eclipsis)
(N) means this form triggers nasalization in some texts but not in others.

Welsh

Alternative forms

Etymology

See dad-.

Pronunciation

Prefix

dat-

  1. undo, un-, dis-
    ‎dat- + ‎plygu (“to fold”) → ‎datblygu (“to unfold, to develop”)
    ‎dat- + ‎cuddio (“to hide”) → ‎datguddio (“to reveal”)
    ‎dat- + ‎drysu (“to entangle, to confuse”) → ‎datrys (“to disentangle, to solve”)
  2. re-
    ‎dat- + ‎canu (“to sign”) → ‎datgan (“to announce, to declare”)

Derived terms

Welsh terms prefixed with dat-
datgan
datgelu
datglymu
datguddio
datgymalu
datgysylltu
datgywasgu
datod
datrys
datblygu

Mutation

Mutated forms of dat-
radical soft nasal aspirate
dat- ddat- nat- unchanged

Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.

References

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

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