Encara no tenim significats per a "affirm gravely".
1It is good practice to carry a candle in the pocket, he affirmed gravely.
2"Even when they love," the older woman affirmed gravely.
3"It is very well," he affirmed gravely.
4"They'll have to, in the end," he affirmed gravely, and continued in a colder voice that with him indicated a flash of temper.