truckle to (?.)

• bend
• bend the neck
• bend to
• bow
• bow and scrape
• bow down
• bow to
• cater to
• cringe to
• crouch
• crouch before
• curtsy
• do homage
• do obeisance
• do service
• fetch and carry
• genuflect
• grovel
• kneel to
• knuckle to
• kowtow
• pander to
• stoop
• toady to
• wait on