[{"Bold_text": "noun", "List Items": ["Machinery.a pistonlike reciprocating part moving within the cylinder of a pump or hydraulic device.", "Automotive.a pistonlike part in the valve of a pneumatic tire.", "Also called force cup force cup,a device consisting of a handle with a rubber suction cup at one end, used as a force pump to free clogged drains and toilet traps.", "a person or thing that plunges .", "a reckless bettor or speculator."]}]