Plunk/plʌŋk/ Definition 1 of 4Pro Tip 1/3Sudden Action Use 'plunk' for actions done abruptly, without gentle placement. She plunked her keys on the counter in a rush. Pro Tip 2/3Audible Impact 'Plunk' suggests a sound is heard when the item lands. He plunked the coin in the jar, and we heard it. Pro Tip 3/3Heaviness Implied Objects that 'plunk' usually have some weight to them. She plunked her heavy bag on the ground.