coruscar

A rare, highly literary verb meaning to sparkle or flash with light, mostly seen in poetry and elevated prose. Almost nobody uses it in everyday Spanish — brillar or relucir are the words actually spoken.

• Las estrellas coruscaban en el cielo nocturno. — The stars sparkled in the night sky.
• La espada coruscaba bajo la luz del sol. — The sword glinted under the sunlight.
• El poema describe cómo coruscaban las olas al amanecer. — The poem describes how the waves sparkled at dawn.

This is a literary rarity — using it in ordinary conversation will sound stilted; brillar is the natural everyday choice.

Often confused with brillar.