ichidan verb, intransitive verb
Neutral intransitive verb for something ceasing to be visible or present. Often used for physical disappearance or fading.
霧が失せて、山が見えてきた。
The fog disappeared and the mountains came into view.
痛みは
The pain quickly faded away.
ichidan verb, intransitive verb
Derogatory or rough command/statement telling someone to go away or disappear. Often used in imperative forms like 失せろ or 失せな.
失せろ！二度と顔を見せるな。
Get lost! Don't ever show your face again.
とっとと失せな。
Just get out of here already.
ichidan verb, intransitive verb
Euphemistic and somewhat old-fashioned way to say 'die'. Softer than 死ぬ, but can sound literary or dramatic.
彼は若くして失せた。
He passed away at a young age.
祖父が静かに失せた。
My grandfather quietly passed away.