vaivenes

n. ups and downs

adj. coming and going; oscillating

n. sway; seesaw

= shuttling back and forth, flip-flop, seesaw [see-saw].
Ex: Bereday calls this type of comparison 'balanced' and describes it as 'a systematic shuttling back and forth between the areas under study'.
Ex: Within this debate, there is flip-flop between those who argue for methods influenced by objectivism and those who argue for a more egalitarian approach.
Ex: The data provides statistical evidence for the existence of a 'seesaw' relationship between density in spring, autumn, and the following spring.