Where does “հարբենալ” come from?

հարբենալ (Armenian) comes from Old Armenian արբենամ, from Old Armenian արբ-, from Proto-Indo-European sr̥bʰ-, from Proto-Indo-European srebʰ- — to sip, gulp, suck.

Ancestry of “հարբենալ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	արբենամ	to get drunk, to intoxicate, to drink to excess
2	Old Armenian	արբ-	to drink; to get drunk
3	Proto-Indo-European	sr̥bʰ-	—
4	Proto-Indo-European	srebʰ-	to sip, gulp, suck

Every word from Proto-Indo-European srebʰ- →Every word from Old Armenian արբ- →Every word from Old Armenian արբենամ →