Thump, n.
Etymology: [Probably of imitative origin; perhaps influenced by dump, v.t.]
1. The sound made by the sudden fall or blow of a heavy body, as of a hammer, or the like. The distant forge's swinging thump profound. Wordsworth. With heavy thump, a lifeless lump, They dropped down, one by one. Coleridge.
2. A blow or knock, as with something blunt or heavy; a heavy fall. The watchman gave so great a thump at my door, that I awaked at the knock. Tatler.
2 other Webster entries under this spelling
Thump, v. t. [imp. & p. p. Thumped; p. pr. & vb. n. Thumping.]
To strike or beat with something thick or heavy, or so as to cause a dull sound. These bastard Bretons; whom our hathers Have in their own land beaten, bobbed, and thumped. Shak.
Thump, v. i.
To give a thump or thumps; to strike or fall with a heavy blow; to pound. A watchman at midnight thumps with his pole. Swift.
Shades of meaning
Fernald has no entry of its own for thump; he lists it under blow.
He lists it without comment; the entries above explain its neighbors.