Answer and Explanation:
The statement that is not true about the story is:
"Sir Gawain and Lady Bertilak secretly agree to meet after Gawain's battle with the Green Knight."
In the story of Sir Gawain and the Green Knight, there is no indication or mention of Sir Gawain and Lady Bertilak secretly agreeing to meet after Gawain's battle with the Green Knight. Their interaction revolves around a different set of events.
To briefly summarize the story, Sir Gawain accepts the challenge presented by the Green Knight, agreeing to exchange one strike for another. Gawain agrees to go to the Green Chapel and face the Green Knight's blow, as per their agreement. However, throughout his journey, Gawain faces various trials and temptations.
Additionally, Sir Gawain agrees to give whatever he wins during the day to the lord of the castle where he seeks shelter. This leads to a game where Gawain receives gifts from the lady of the castle, but he dutifully gives them to the lord each day.
To summarize, while Sir Gawain agrees to exchange strikes with the Green Knight, agrees to go to the Green Chapel, and agrees to give his winnings to the lord, there is no mention of a secret agreement to meet Lady Bertilak after the battle with the Green Knight.