high tide vs time of the month

high tide

noun

  • Synonym of menstruation 

  • The natural tide at its highest level for a particular tidal cycle at a certain place. 

  • climax, culminating point or phase 

  • The time of day when the sea has risen to its highest level. 

time of the month

noun

  • Synonym of menstruation: the monthly period during which a fertile woman menstruates. 

How often have the words high tide and time of the month occurred in a corpus of books? (source: Google Ngram Viewer )