Definition of thump :
1. A blow or knock, as with something blunt or heavy; a heavy fall.
2. The sound made by the sudden fall or blow of a heavy body, as of a hammer, or the like.
3. To give a thump or thumps; to strike or fall with a heavy blow; to pound.
4. To strike or beat with something thick or heavy, or so as to cause a dull sound.
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snap (part of speech: noun)