fluctuate
Translation
to vary, to rise and fall, to waver
Examples
Prices can fluctuate from day to day.
Prices can fluctuate from day to day.
His mood seems to fluctuate a lot.
His mood seems to fluctuate a lot.
Grammar Patterns
((sth.)) to fluctuate (of a level, price, etc.) to change frequently Temperatures fluctuate during the day.
to fluctuate ((between sth. and sth.)) to change between two points The price fluctuates between $10 and $15.
Similar Words
Synonyms: vary, oscillate, waver; Antonyms: stabilize, remain constant
Etymology
From Latin 'fluctuare' (to flow, to wave), from 'fluctus' (a wave).
Memory Tips
The 'flu-' part sounds like 'flow'. Imagine waves on the sea flowing up and down, which is what 'fluctuate' means.