fluctuate

 
Pronunciation: /ˈflʌktʃʊeɪt, -tjʊ-/

verb

[no object]
  • rise and fall irregularly in number or amount: trade with other countries tends to fluctuate from year to year (as adjective fluctuating) a fluctuating level of demand

Origin:

mid 17th century (earlier (late Middle English) as fluctuation): from Latin fluctuat- 'undulated', from the verb fluctuare, from fluctus 'flow, current, wave', from fluere 'to flow'