"Slidden out of" is a phrase that indicates the gradual or quiet movement of someone or something slipping away from a particular place or situation. The word "slidden" in itself is a past participle form of the verb "slide." There are various synonyms that can be used to describe this particular action, such as sneak away, slip out, drift away, fade out, move slowly, drift off, trickle away, slink off, or sidle away. These synonyms can be used interchangeably, depending on the context and intensity of the situation. With these words, one can be better equipped to describe the act of someone or something slipping away quietly.