daingen

Old Irish

Unknown. It can't be related to Old Irish dingid (“to press”) because of the vowel. It could be related to Proto-Indo-European *dʰegʷʰ- (“to burn”) but the semantic connection is unclear.[1][2] Bezzenberger compares Proto-Germanic *tangijaną (“to fasten”), from *denḱ- (“to bite”).

daingen (comparative daingniu)

o/ā-stem
Singular	Masculine	Feminine	Neuter
Nominative	daingen	daingen	daingen
Vocative	daingin* daingen**	daingen
Accusative	daingen	daingin
Genitive	daingin	daingne	daingin
Dative	daingen	daingin	daingen
Plural	Masculine	Feminine/neuter
Nominative	daingin	daingne
Vocative	daingniu daingne†
Accusative	daingniu daingne†
Genitive	daingen
Dative	daingnib
Notes	modifying a noun whose vocative is different from its nominative *modifying a noun whose vocative is identical to its nominative † not when substantivized

daingen n

Neuter o-stem
	Singular	Dual	Plural
Nominative	daingen^N	daingen^N	daingen^L, daingne
Vocative	daingen^N	daingen^N	daingen^L, daingne
Accusative	daingen^N	daingen^N	daingen^L, daingne
Genitive	daingin^L	daingen	daingen^N
Dative	daingen^L	daingnib	daingnib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

Old Irish mutation
Radical	Lenition	Nasalization
daingen	daingen pronounced with /ð(ʲ)-/	ndaingen
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

Matasović, Ranko (2009) “Di-N-G-O-”, in Etymological Dictionary of Proto-Celtic (Leiden Indo-European Etymological Dictionary Series; 9), Leiden: Brill, →ISBN
Vendryes, Joseph (1996) Lexique Étymologique de l'Irlandais Ancien [Etymological lexicon of Old Irish] (in French), volume D, Dublin, Paris: Dublin Institute for Advanced Studies, Centre national de la recherche scientifique, pages D-11-12