harbor UK /ˈhɑːbə/US /ˈhɑɹbɚ/noun 5verb 4forms 3 noun5 •a piece of water next to land, held safe by walls or by the shape of the coast, where ships tie up •Any place of shelter.The neighborhood is a well-known harbor for petty thieves. •A mixing box for materials. •(no longer used) Shelter, refuge. •(no longer used) A house of the zodiac, or the mansion of a heavenly body. verb4 •To provide a harbor or safe place for.The docks, which once harbored tall ships, now harbor only petty thieves. •To hold or persistently entertain in one's thoughts or mind.She harbors a conviction that her husband has a secret, criminal past. •To take refuge or shelter in a protected expanse of water.The fleet harbored in the south. •To drive (a hunted stag) to covert. formsharbored · harboring · harbors