n. /up"swing'/ ; v. /up swing"/ , n. , v. , upswung, upswinging .
n.
1. an upward swing or swinging movement, as of a pendulum.
2. a marked increase or improvement: an upswing in stock prices.
v.i.
3. to make or undergo an upswing.
[ 1920-25; UP- + SWING 1 ]