This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Third-person singular simple present indicative form of overbuild.

"You're going to sleep better at night, and there's no real need to be in it when it goes through its inevitable overbuilds, and then pullbacks, and overbuilds, and pullback."

overbuilding    overbuilds    overbuilt   

overbuilder