constant vs yo-yo

constant

noun
  • A quantity that remains at a fixed value throughout a given discussion. 

  • Any property of an experiment, determined numerically, that does not change under given circumstances. 

  • That which is permanent or invariable. 

  • An identifier that is bound to an invariant value; a fixed value given a name to aid in readability of source code. 

adj
  • Firm; solid; not fluid. 

  • Unchanged through time or space; permanent. 

  • Steady in purpose, action, feeling, etc. 

  • Bounded above by a constant. 

  • Consistently recurring over time; persistent. 

yo-yo

noun
  • A toy consisting of a spheroidal or cylindrical spindle having a circular groove in which string is wound; it is used by holding the string in the fingers and reeling the spindle up and down by movements of the wrist. 

  • A cloth rosette formed by gathering the outside edge of a circle of fabric in toward the centre using a running stitch. 

  • Someone who vacillates. 

  • A dogfighting maneuver involving the attacker temporarily exchanging altitude for airspeed, or vice versa, in order to rapidly catch up with the defender or to prevent an overshoot. 

  • A volatile market that moves up and down. 

  • A foolish, annoying or incompetent person. 

verb
  • To vacillate; to move up and down. 

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