Usar "brisk up" en una oración

1. The darks are quite brisk up here with frost or snow even in summer, during which the floater is a limp tent in a field

2. And it was true that, after being hang-dog to excess, during the second week the staff, finding it against nature to go on being sorry indefinitely, did begin to brisk up, to the great scandal of Miss Cartwright, who considered this brisking-up altogether premature, and would have had them on their knees, for at least a year