sell down the river vs two-time

sell down the river

verb
  • To betray, especially in a manner which causes serious difficulty for the one betrayed. 

two-time

verb
  • To be unfaithful to one's (sexual) partner. 

  • To double-cross. 

adj
  • On two occasions; twice. 

How often have the words sell down the river and two-time occurred in a corpus of books? (source: Google Ngram Viewer )