also: たれしも
expression
Emphatic expression meaning 'everyone' or 'anyone', stronger than 誰も. Used in affirmative or general statements.
誰しも失敗はあるものだ。
Everyone makes mistakes.
誰しも幸せを願っている。
Everyone wishes for happiness.
expression
Used with a negative verb to mean 'no one'. More emphatic than 誰も in negative contexts.
See also: 誰も
誰しもそんなことはできない。
No one can do such a thing.
誰しも完璧ではない。
No one is perfect.
Compound of 誰 (dare, 'who') and しも (shimo, an emphatic particle). The particle しも adds emphasis, making the expression stronger than 誰も.