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Cost
From Teflpedia
Cost is an English word with verbal and nominal meanings principally related to both time and money.
As a verb it is an irregular lexical verb; it has the third person form “costs,” the -ing form “costing,” but an invariant preterite and past participle, i.e. “cost.” This may be over-regularised to *"costed.” Costed however is used as a past participial adjective, particularly in British English.
The phrasal verb “cost out" tends to be used as a regular verb; so its preterite is “costed out" rather than “cost out"[1]
It’s usually, though not always, used transitively.
