In Colombia is a colloquial way of saying "I said nothing", "I held the desire to say something" or "I was silent while it details". Many times intends to say is kept silent to avoid major conflicts. Saving prudence.
Expression figuratively by "hold it say something", as if the only way to avoid the phrase stop the tongue with teeth. The verb is used in reflective because it is not possible, for that matter, that the alien tongue bite.