1. a rubber cup on a handle used to clear blocked drains or toilets
2. a part of a machine or device that moves up and down
3. a person who dives or plunges into water

Examples

• She used a plunger to unclog the bathroom sink.
• The toilet was blocked, so we needed to get the plunger.
• The plunger in the syringe pushes the medicine through the needle.
• The coffee maker’s plunger pressed down to filter the grounds.
• The brave plunger dove from the high cliff into the ocean.
• He worked as a plunger, retrieving items from the harbor bottom.