If something is smashed or blown to smithereens, it breaks into very small pieces. She dropped the vase and smashed it to smithereens = pieces, bits. smash/blow etc sth to smithereens to destroy something by breaking it into very small pieces, or with an explosion (smidirin, from smiodar )
a collection of small fragments considered as a whole; "Berlin was bombed to smithereens"; "his hopes were dashed to smithereens"; "I wanted to smash him to smithereens"; "the toilet bowl ws blown to smitereens"