absconder

to set (said of the Sun at sunset)

Borrowed from Latin abscondere (“to hide”). According to the Trésor de la langue française, attested since the 16th century, and a doublet of the then-contemporary abscondre. Cognate with the (now obsolete) French esconcer (“to set (said of the Sun)”), and Picard esconser (“to set (said of the Sun)”).