1DF bread that is crusty is pleasant to eat because it has a hard crust :
a crusty baguette
a crusty baguette2 informal someone who is crusty is bad-tempered [= grumpy]:
a crusty old man
a crusty old man3 having a thin dry hard layer of something on the surface :
The lake was ringed by crusty salt deposits.
The lake was ringed by crusty salt deposits.
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