1. (

• speculator ,
• plunger

) someone who risks losses for the possibility of considerable gains ;

2. (

• diver ,
• plunger ,

) someone who dives (into water) ;

3. (

• plunger ,
• plumber's_helper

) hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains ;

4. (

• piston ,
• plunger

) mechanical device that has a plunging or thrusting motion ;