KOWTOW is validvalid

to behave in a servile manner [v KOWTOWED, KOWTOWING, KOWTOWS] : KOWTOWER [n]

22,700 of 196,601 in NWL2023·also valid in CSW24

(Chinese) the prostration made by mandarins and others to their superiors, either as homage or worship, by knocking the forehead on the ground [n -S] / to perform a kowtow, also KOTOW [v -ED, -ING, -S]