Genesis 25:34 New English Translation

³⁴Then Jacob gave Esau some bread and lentil stew; Esau ate and drank, then got up and went out.^[a] So Esau despised his birthright.^[b]

Genesis 25:34 sn The style here is typical of Hebrew narrative; after the tension is resolved with the dialogue, the working out of it is recorded in a rapid sequence of verbs (“gave”; “ate”; “drank”; “got up”; “went out”). See also Gen 3:1-7 for another example.
Genesis 25:34 sn So Esau despised his birthright. This clause, which concludes the episode, is a summary statement which reveals the underlying significance of Esau’s actions. “To despise” means to treat something as worthless or with contempt. Esau’s willingness to sell his birthright was evidence that he considered it to be unimportant.

New English Translation (NET)