"'I beseech you, Sire,' he said, 'Let this game be mine'" (lines 118-119).
The Green Knight comes to the round table with an odd challenge: whoever cut his head off would get to keep his axe under one condition, he got to return the favor a year later.
"Sir Gawain laid hold of the ax and he hefted it high, His pivot foot thrown forward before him on the floor, And then, swiftly, he slashed at the naked neck" (Lines 146-148).
Sir Gawain took the ax from King Arthur. He then cut off The Green Knight's neck with one swift slash
"'A stroke the same as you’ve given, for well you deserve To be readily requited on New Year’s morn... Therefore if you seek to find me, you shall not fail. Come or be counted a coward, as is fitting.'... And haled away through the hall-door, his head in his hand" (Lines 176-182).
The Green Knight tells Sir Gawain that in a year he must find him and allow the Green Night to take his strike.
On his journey to meet the Green Knight, Gawain stops at a castle. He meets a husband and wife. The lord goes hunting and when he returns, Gawain gives him the kisses that the lady gives him. On the third day the lady gives him a sash that protects him from death. He does not tell the lord about the sash and continues on his journey.
"Gawain did, and she gave him the gift with great pleasure And begged him, for her sake, to say not a word, And to keep it hidden from her lord. And he said he would" (Lines 133-135).
"I take one stroke, that’s all, For that was the compact we Arranged in Arthur’s hall; But now, no more for me!” (Lines 306-309).
Gawain finds the Green Knight. The Knight takes the three blows, only slightly injuring his neck. Gawain remains alive.
“'That sash you wear by your scabbard belongs to me; My own wife gave it to you, as I ought to know. I know, too, of your kisses and all your words And my wife’s advances, for I myself arranged them. It was I who sent her to test you. I’m convinced You’re the finest man that ever walked this earth'" (Lines 336-341).
The Green Knight reveals that he was the lord all along. He fails the test by not giving the sash to the lord, but is still an honorable knight. The Green Knight forgives him.