What does alight mean?
The definition of alight
A*light”, v. i.
[imp. & p. p. Alighted sometimes Alit; p. pr. & vb.n. Alighting.]
Etym: [OE. alihten, fr. AS. alihtan; pref. a- (cf. Goth. us-, G. er-, orig. meaning out) + lihtan, to alight, orig. to render light, to remove a burden from, fr. liht, leoht, light. See Light, v. i.]

1 To spring down, get down, or descend, as from on horseback or from a carriage; to dismount.
2 To descend and settle, lodge, rest, or stop; as, a flying bird alights on a tree; snow alights on a roof.
3 To come or chance (upon). [R.]

A*light”, a.
Etym: [Pref. a- + light.]

Lighted; lighted up; in a flame. “The lamps were alight.” Dickens.