moon vs mull over

moon

verb
  • To spend time idly, absent-mindedly. 

  • To rise in price rapidly or suddenly. 

  • To gaze at lovingly or in adoration. 

  • To display one's buttocks to, typically as a jest, insult, or protest. 

  • (usually followed by over or after) To fuss over something adoringly; to be infatuated with someone. 

  • To expose to the rays of the Moon. 

  • To shoot the moon. 

  • To adorn with moons or crescents. 

noun
  • A month, particularly a lunar month. 

  • A representation of the moon, usually as a crescent or as a circle with a face; a crescent-shaped shape, symbol, or object. 

  • A crescent-like outwork in a fortification. 

  • Any natural satellite of a planet. 

  • The thirty-second Lenormand card. 

  • In hearts, the action of taking all the point cards in one hand. 

  • The eighteenth trump/major arcana card of the Tarot. 

mull over

verb
  • To think deeply about something; to ponder, deliberate or ruminate. 

How often have the words moon and mull over occurred in a corpus of books? (source: Google Ngram Viewer )