What constitutes an explicit declaration (tasreeh) in proposing marriage?

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An explicit declaration is wording that can only be interpreted as a proposal for marriage. Examples include saying, 'Marry yourself to me,' or 'When your 'Iddah' ends, I will marry you.' This explicit declaration is generally forbidden during the 'Iddah' of a woman in a revocable divorce or a third divorce, but permitted for the husband of a woman in an irrevocable separation permissible for him to remarry. It is speculated that this explicit declaration aligns with the prohibition against making secret promises ({but do not promise them secretly} [Quran 2:235]).