plunk

A brief, dull sound, such as the sound of a string of a stringed instrument being plucked, or the thud of something landing on a surface.

They listened and could hear the steady plunk, plunk of an axe somewhere far above them.

A (heavy) blow or hit.

A dollar.

Den I gives him a five-plunk piece, and he gins me the shange.

Dere's a loidy here […] dat's got a necklace of jools what's wort' a hundred t'ousand plunks. Honest, boss. A hundred t'ousand plunks.

A large sum of money.

With a brief, dull sound, such as the thud of something landing on a surface.

Directly, exactly, precisely.

"Bang!" went a gun behind me. I heard the whistle of shot. Something stung me sharply on the cheek, and I fell forward on my face, giving myself up for lost. […] "Oh, ye will never dee o' a chairge o' guid saft garden peas!" said the daft lassie, scornfully. "Maybe no," retorted I, for my choler was raised. "They are a' vera weel in broth, but if you got them plunk on the jaw, wi' a strong chairge o' powder ahint them, they might bring the water to your e'en as well as mine."

[I]t's one thing to be buried with all your pleasures, like Sardanapalus; it's another to be buried right plunk in front of them, where you can see them.

Often reduplicated: used to represent a brief, dull sound, such as the sound of a string of a stringed instrument being plucked, or the thud of something landing on a surface.

Look at me; is my eye dilated? do you notice a quiver anywhere? Feel my pulse: plunk—plunk—plunk—same as if I were asleep.

It was the noise of rowing, hard, fast rowing, the noise of two pairs of oars in a native boat, pin oars, and the slap, slap of a boat's bows into the short waves. She knew that noise well. It came nearer and nearer. It passed close by her. Plunk, plunk. She could hear the splash of the oars so clearly that she almost thought she could see the boat in the dark.