To bow, to bend oneself as a gesture of respect or deference(verb)
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Use "bow down" in a sentence
"Towing a huge ship, listing with thousands of tons of water inside her and the bow down by six feet, was a dangerous and delicate operation; Kennedy needed all of his experience and skill."
"A badly wounded but still defiant Batis was brought before Alexander, who threatened him with cruel punishments if he would not bow down before him."
"The particular evil of being forced at knife-point to bow down and pledge allegiance to pagan gods had passed away."