膝下

at the knee (in reference to children) / (salutation used in letters to parents or grandparents)

old variant of 膝[xi1]

knee

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

lit. the man has gold under his knees; fig. a man who does not easily kneel in front of others (owing to pride or moral integrity)