flagging vs low water

flagging

noun
  • A pavement or sidewalk of flagstones; flagstones, collectively. 

  • The skewing or bending of the upper part of a television picture due to imperfect synchronization of the video signal. 

  • Use of a handkerchief code or analogous display to signal sexual interests. 

  • The process by which something flags or tires. 

adj
  • Becoming tired or less dynamic; declining in strength; dwindling. 

low water

noun
  • The temporary situation of having little money. 

  • The lowest stage of a river. 

  • The location of low tide in a coastal area. 

How often have the words flagging and low water occurred in a corpus of books? (source: Google Ngram Viewer )