smith ‧ e ‧ reens /ˌsmɪðəˈriːnz/ BrE AmE noun [plural]
[ Date: 1800-1900 ; Language: Irish Gaelic ; Origin: smidirin , from smiodar 'small piece' ]
smash/blow etc something to smithereens informal to destroy something by breaking it into very small pieces, or with an explosion:
The shop was blown to smithereens by the explosion.