"Show opt-in dialog" refers to the process of displaying a pop-up window that seeks user consent for further communication, promotions, or data collection. Synonyms for this phrase could include "display opt-in message," "pop-up consent window," "offer subscription form," "prompt newsletter subscription," or "request user permission." Other variations could include "show sign-up form," "display consent request," "offer updates notification," or "prompt user agreement." Regardless of the phrasing, the key goal for businesses is to ensure that their opt-in messages are transparent, clear, and easy for users to understand, as this ultimately helps build trust, loyalty, and long-term engagement.