adverb
gasping; breathing heavily
Describes the manner of breathing with difficulty, often from exertion or emotional distress. Used adverbially.
See also: 喘ぐ
彼はあえぎあえぎ階段を上った。
He climbed the stairs, gasping for breath.
I could hear a voice speaking while breathing heavily.
喘ぐ is the base verb meaning 'to gasp' or 'to struggle for breath'. あえぎあえぎ is the reduplicated adverbial form, emphasizing the ongoing, breathless manner.
Reduplication of the continuative form (連用形) of the verb 喘ぐ (あえぐ, 'to gasp'), creating an adverb that describes doing something while gasping or breathing heavily.