Or HaChaim on Genesis 27:42/אור החיים על בראשית כ״ז:מ״ב

1 עשו בנו הגדול, her elder son Esau. The reason she used the word הגדול "the bigger one," instead of הבכיר, "the older one", was because she was describing Esau's relative prowess compared to the physically smaller Jacob.

2מתנחם לך, consoles himself concerning you. The thought of killing you acts as consolation for him regarding what you have done to him. By killing you he means to restore to himself both the birthright and the blessing.