B1
to say that you will certainly do something or that something will certainly happen
Dictionary examples:
I promise to finish my homework, right after I invent time travel. (0.0)
She promised to wake up early, but her bed had other ideas. (0.0)
I promise to eat all the vegetables, even if they're alien broccoli! (0.0)
She promised to write to me every week. (14.9)
"I'll come by and see you every day," she promised. (19.3)
He promised faithfully to call me every week. (51.6)
Paul promised me that he'd cook dinner tonight. (60.2)