Brisk

·adj Full of spirit of life; effervesc/ng, as liquors; sparkling; as, brick cider.

II. Brisk ·adj Full of liveliness and activity; characterized by quickness of motion or action; lively; spirited; quick.

III. Brisk ·vt & ·vi To make or become lively; to Enliven; to Animate; to take, or cause to take, an erect or bold attitude;

— usually with up.

to brisk up
To come up with life and speed; to take an erect or bold attitude.--Webster. An Americanism. ...

Dictionary of American Words And Phrases by John Russell Bartlett.