crust

crust /ˈkrʌst/ noun
plural crusts
crust
/ˈkrʌst/
noun
plural crusts
Britannica Dictionary definition of CRUST
1 
: the hard outer surface of bread
[count]
[noncount]
2 
: the outside part of a pie : piecrust
[count]
[noncount]
3 
[count, noncount] : the bread that is used to make a pizza
4 
[count, noncount] : a hard layer on the surface of something

earn a/your crust

British, informal
: to earn the money that you need to live : to earn a living