Anything which is liable to
roll around an
enterprise which is
rocked by the
day-to-day swells of
fortune. On
sailcraft in
days of yor, an actual
cannon -- which would do
nasty damage like
mash testes if not
secured when
rough seas were
on the rise. In
politics, a
person insufficiently
coerced who may
spill the beans if not
attended to immediately.