n. 25B6; noun hot-air balloon, barrage balloon; airship, dirigible, Zeppelin; envelope, gasbag; informal blimp.
25B6; verb
her long skirt ballooned in the wind : SWELL (OUT), puff out/up, bulge (out), bag, belly (out), fill (out), billow (out).
the company's debt has ballooned : INCREASE RAPIDLY, soar, rocket, shoot up, escalate, mount, surge, spiral; informal go through the roof, skyrocket.
plummet.