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Coarse crackles are discontinuous, brief, popping lung sounds. Compared to fine crackles they are louder, lower in pitch and last longer. They have also been described as a bubbling sound. You can simulate this sound by rolling strands of hair between your fingers near your ear.
The definition of coarse is something that has large particles, poor quality, a rough texture or something that is in bad taste. 1  An example of coarse is large particles of ground pepper. 2  An example of coarse is thick and dry hair. 3  An example of coarse is the texture of sandpaper.