This is the 9084th most frequent Russian word.
сош
The Russian word "сош" does not carry any meaning by itself; it might be a misspelling or an abbreviation.
In this sentence, 'сошла' is a past tense, third person singular feminine form of the verb 'сойти', which here means 'descended'. It is used to describe the action of moving down to a lower level.
Дорога сошла к реке.
The road descended to the river.
Here, 'сошёл' is a past tense, third person singular masculine form of 'сойти'. It is used in the phrase 'сойти с ума', which idiomatically means 'to go mad' or 'lose one's mind'.
Он сказал, что сошёл с ума.
He said that he went mad.
In this case, 'сошито' is a past passive participle form derived from the verb 'сшить', which means 'to sew'. Though visually similar, its root is 'шить' and not the same as 'сойти', showing how morphology can create similar-looking forms with different meanings.