used to express dismay or surprise

‘Crumbs,’ said Emily, ‘how embarrassing.’

a small fragment of bread, cake, or biscuit

she brushed some cake crumbs off her dress

a crispy crumb topping

a very small amount of something

the Budget provided few crumbs of comfort

an objectionable or contemptible person

he's an absolute crumb

granulated rubber, usually made from recycled car tyres

cover (food) with breadcrumbs

while the sweet potato is cooking, crumb the fish