It is a simile as it is describing the joke as last week's breakfast rather than saying it 'is' last weeks brekfast
What the verb in the sentences over time,the bread grew stale
i think stale bread is not necessary but fresh bread
One can throw stale bread out in the garbage.
The bread is so stale, that I chipped a tooth!
You can transform stale bread into a delicious dish by making bread pudding, croutons, or breadcrumbs.
mold bread has green fungus growing out of it. stale means old but stiff and hard...i think
Nothing. Stale bread is perfectly safe to eat because it is simply not as moist as fresh bread.
To refresh bread that had gone stale.
Eventually it can do that. Mold can grow on bread as well as any other food. Airborne mold spores only require a moist environment to thrive and colonize. This process is not as rapid though as compared to mold forming on food in a warmer environment.
If it is stale then yes.
Yes
You can, but it will cause the bread to dry out and go stale.