intransitive. Of a thing: to move briskly or lightly, esp. with alternating or irregular motion; to change or alternate rapidly, to flicker; to…

intransitive. To show varying colours like an opal. Obsolete.

intransitive. To exhibit iridescence like that of precious opal. Also figurative.

intransitive. To exhibit iridescence; to shine in an iridescent manner.

To present the appearance of a brightly coloured and constantly changing pattern; to cause to come together or coalesce with pleasing results.