i Register
In some senses, defreak is marked as colloquial, rare. Watch for register when choosing this word.
verb
To cause no longer to be freakish, or a freak.
To cause no longer to be freaked out; to calm down.
I tell myself this is progress. After all, the first step to defreaking arachnaphobes is to hand them a picture of a cute baby spider; the big-hairy-tarantula-fondling comes later.