zu:m v. & n. --v. 1 intr.
move quickly,
esp.
with a buzzing
sound. 2 a intr.
cause an
aeroplane to mount at
high speed and a steep
angle. b tr. cause (an aeroplane) to do
this. 3 a intr. (of a camera) close up rapidly
from a long shot to a close-up. b tr. cause (a
lens or camera) to do this. --n. 1 an aeroplane's steep
climb. 2 a zooming
camera shot. øzoom lens a lens allowing a camera to zoom by varying
the focal length. [imit.]