water offered to the gods and Buddha
A religious offering of water placed on a Buddhist altar or Shinto kamidana. The term is specific to ritual contexts.
Every morning, I offer water to the Buddhist altar.
The water offered at the Shinto altar is changed daily.
Compound of 御 (honorific prefix) + 供 (offering) + 水 (water). The reading ごくうすい reflects the honorific 御 (ご) and the on'yomi of 供水.