Idiom
break down somethingbreak down (something)
1.
to divide something into smaller parts.
The quickest way to get this job done is to break it down into a number of specific steps.
2.
to cause something to weaken or decay.
Temperatures were high enough to break down the chemicals.One sniff of that chocolate was enough to break down my determination not to eat sweets.
3.
to explain something.
Let me break it down for you — when a dog shows its teeth, it's about to attack you.