slack vs washout

slack

noun
  • A tidal marsh or shallow that periodically fills and drains. 

  • Unconditional listening attention given by client to patient. 

  • A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place. 

  • The part of anything that hangs loose, having no strain upon it. 

  • Small coal; coal dust. 

  • A valley, or small, shallow dell. 

adv
  • Slackly. 

adj
  • Moderately warm. 

  • Vulgar; sexually explicit, especially in dancehall music. 

  • Not active or busy, successful, or violent. 

  • Excess; surplus to requirements. 

  • Lax; not tense; not firmly extended. 

  • Lacking diligence or care; not earnest or eager. 

  • Lax. 

  • Moderate in speed. 

  • Weak; not holding fast. 

verb
  • To slacken. 

  • To lose cohesion or solidity by a chemical combination with water; to slake. 

washout

noun
  • A channel produced by the erosion of a relatively soft surface by a sudden gush of water. 

  • An overwhelming victory; a landslide. 

  • An appliance designed to wash something out. 

  • The cleaning of matter from a physiological system using a fluid. 

  • The cleaning of the inside of a (locomotive) boiler to remove scale (limescale). 

  • A breach in a road or railway caused by flooding. 

  • A period between clinical treatments in which any medication delivered as the first treatment is allowed to wash out of the person before the second treatment begins. 

  • A disappointment or total failure; an unsuccessful person. 

  • The aerodynamic effect of a small twist in the shape of an aircraft wing. 

  • The action whereby falling rainwater clean particles from the air. 

  • A sporting fixture or other event that could not be completed because of rain. 

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