While Clif waited, leering, she placidly investigated the inside of a chicken sandwich and assented, "Um-huh."
He assented, not very pleasantly.
Twyford had blankly assented to his suggestion that Leora be invited hither, and if she and Joyce Lanyon should become such friends that Joyce would never again turn to him in loneliness, he was willing, he was eager—he was almost eager.
There are no more uses of "assent" in the book.
Show samples from other sources
She takes my silence as assent.
Sabaa Tahir -- An Ember in the Ashes
Their murmurs of assent and disapproval gave her a sense of order and rightness.