Where does “follejar” come from?

follejar (Catalan) comes from Catalan foll, from Old Catalan fofl, from Latin follis, from Proto-Indo-European bʰelǵʰ-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “follejar”, step by step

Step	Language	Word	Meaning
1	Catalan	foll	mad, crazy
2	Old Catalan	fofl	—
3	Latin	follis	bellows; purse, sack, money bag; a small value...
4	Proto-Indo-European	bʰelǵʰ-	to swell
5	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
6	Proto-Indo-European	bʰōl-	—

Every word from Proto-Indo-European bʰōl- →Every word from Proto-Indo-European bʰel- →Every word from Proto-Indo-European bʰelǵʰ- →