noun
panting; gasping; heavy breathing
Refers to the sound of labored breathing, often in contexts of exhaustion, arousal, or medical distress.
彼は走った後、喘ぎ声をあげた。
He let out a panting sound after running.
隣の部屋から喘ぎ声が聞こえた。
I heard heavy breathing from the next room.
喘ぐ is the verb meaning 'to pant' or 'to gasp'; 喘ぎ声 is the noun for the sound itself.
Compound of 喘ぎ (あえぎ, 'panting', the continuative form of 喘ぐ) and 声 (こえ, 'voice' or 'sound'), with rendaku voicing of こえ to ごえ.