IPA: //ˈhɔːrsər//
KK: /hɔrsɚ/
Having a rough or harsh sound, often due to a sore throat or vocal strain, and in this case, it refers to a greater degree of that quality.
After shouting at the game, his voice became hoarser than usual.
Comparative: hoarser
Superlative: hoarsest
Hoarser → The word 'hoarser' is derived from 'hoarse' (from Old English 'hars', meaning rough or harsh) and the comparative suffix '-er' (meaning more). Thus, 'hoarser' means more hoarse or having a rougher quality of voice.
Think of 'hoarse' meaning rough, and the '-er' indicates more of that quality — so 'hoarser' means having a voice that is more rough.