The answer to this is a promise. If you don't keep a promise it would break.
A promise can be described as an assurance or an agreement that a person is actually going to do something. It is similar to making a pledge or a vow.
When a promise is not kept, it means that the party involved has done something that is contrary to what they had agreed to do in the first place.
The opposite of keeping a promise is breaking a promise. Therefore this is the answer to the question.
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