dat-

See also: Appendix:Variations of "dat"

Old Irish

Pronunciation

• IPA^(key): /dad/

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 sing.	m-L	dom-L, dam-L		-um
2 sing.	t-L	dot-L, dat-L, dut-L, dit-L		-ut
3 sing. m.	a-N, e-N	d-N	id-N, did-N, d-N	-i, -it
3 sing. f.	s-(N)	da-		-us
3 sing. 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.

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Welsh

Alternative forms

• dad-

Etymology

Cognate with Cornish das-.

Pronunciation

• IPA^(key): /dat/

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”)

   Synonym: dad-

Derived terms

Welsh terms prefixed with dat-

Mutation

Welsh mutation
radical	soft	nasal	aspirate
dat-	ddat-	nat-	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

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