Noun
A
device
used
in
film
production
,
having
hinged
boards
that
are
brought
together
with
a
clap
,
used
at
the
start
of
each
take
of
a
motion picture
or
other
video
production
to
be
able
to
synchronize
picture
and
sound
during
editing
.
Verb
To
use
a
clapperboard
,
especially
to
clap
it
to
start
a
film
take
.