útiseta (ON) noun

Sitting outside with the intention of performing sorcery. It has been classified as a type of divination or necromancy and was considered an unatoneable crime (óbótamál, see urbotamal) in the Icelandic and Norwegian laws. Útiseta appears to have been known in Norway and Iceland, and there may have been some connection to similar practices found in Scotland and on the Continent.

sitting out at night ONorw GuL Krb
sitting outside OIce Jó Mah 2
OIce Js Mah 6
staying outside ONorw FrL Var 45
Expressions:

útiseta at vekja tröll upp (ON)

sitting outside to wake up trolls OIce Js Mah 6 ONorw GuL Krb MLL Mah 4

spending the night outside to practice witchcraft OIce Jó Mah 2

staying outside to wake up ghosts ONorw FrL Var 45

Refs:

CV; F; GAO s.v. Ekstase, Orakel, Seherinnen; KLNM s.v. spådom