to dismount from a horse, descend from a vehicle, etc.

to settle or stay after descending

The bird alighted on the tree.

to encounter or notice something accidentally.

verb

come down , debark , descend , disembark , dismount , get off , light , perch , settle , touch down , set down , aglow , arrive , bright , deplane , land , lighted , radiant , rest , roost

phrasal verb

bump into , chance on , come across , come on , find , happen on , light on , run across , run into , stumble on , tumble on

adjective

ablaze , afire , aflame , conflagrant , fiery , flaming