French word baisser comes from Latin -ionem, Late Latin bassus, Latin bassus, and later Latin *bassio ((Vulgar Latin) I lower.)

Detailed word origin of baisser

Dictionary entry	Language	Definition
-ionem	Latin (lat)
bassus	Late Latin (LL)
bassus	Latin (lat)	(Late Latin, Medieval Latin) thick, fat, stumpy, short, low, base.
*bassiare	Vulgar Latin (la-vul)
*bassio	Latin (lat)	(Vulgar Latin) I lower.
baissier	Old French (fro)	To lower.
baisser	French (fra)	(reflexive, se baisser) To lower oneself; to bend over.. To fail.. To go down, fall.. To lower.. To turn down (as a volume/setting).

Words with the same origin as baisser