The word "allow go" is a phrase that signifies permission or consent to release or relinquish someone or something. It implies allowing a person to leave without hindrance or giving up a possession without any resistance. The opposite of the word "allow go" would be to restrain or hold on, to disapprove or oppose, to retain or keep, or to prohibit or forbid. These antonyms suggest the opposite of letting go or releasing someone or something, which could potentially cause conflict or tension. In essence, the opposite of "allow go" would be to restrict, retain, or deny permission to release or relinquish someone or something.