Jack-in-a-box
Definition of Jack-in-a-box
1.
(Bot.)
A
tropical
tree
(
Hernandia
sonora
),
which
bears
a
drupe
that
rattles
when
dry
in
the
inflated
calyx
.
2.
A
child
'
s
toy
,
consisting
of
a
box
,
out
of
which
,
when
the
lid
is
raised
,
a
figure
(
usually
a
clown
)
springs
;
also
called
jack-in-the-box
.
3.
(Mech.)
An
epicyclic
train
of
bevel
gears
for
transmitting
rotary
motion
to
two
parts
in
such
a
manner
that
their
relative
rotation
may
be
variable
;
applied
to
driving
the
wheels
of
tricycles
,
road
locomotives
,
and
to
cotton
machinery
,
etc
.;
an
equation
box
;
a
jack
frame
; -
called
also
compensating
gearing
.
4.
A
large
wooden
screw
turning
in
a
nut
attached
to
the
crosspiece
of
a
rude
press
.
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Jack-at-a-pinch
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Jack-by-the-hedge
-Jack-in-a-box-
Jack-in-office
Jack-in-the-bush
Jack-in-the-green
jack-in-the-pulpit
Jack-o'-lantern
Jack-of-the-buttery
Jack-of-the-clock
Jack-on-both-sides
Jack-out-of-office
Jackal
Jackanapes
Jackaroo
Jackass
Jackass bark
Jackass deer
Jackass hare
Jackass penguin
jackboot
jackboot tactics
jackbooted
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