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 pot
Jack rabbit
Jack rafter
Jack salmon
Jack sauce
Jack shaft
Jack sinker
Jack snipe
Jack staff
Jack the Giant Killer
Jack timber
Jack towel
Jack tree
Jack truss
Jack yard
Jack-a-dandy
Jack-a-lent
Jack-at-a-pinch
Jack-at-all-trades
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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