Senses
磕头/ 磕頭 to kowtow
to kneel and touch one's forehead to the ground as a sign of deep respect, traditionally used for elders or superiors
磕头/ 磕頭 to beg
to beg or entreat someone humbly and persistently for help
磕头/ 磕頭 to apprentice
to formally acknowledge someone as one's master or teacher in a traditional apprenticeship
磕头/ 磕頭 to fall asleep
to fall asleep quickly as soon as one reaches the bed