It sounds like the noise you'd make on a small drum, but actually tump isn't anything to do with sounds at all. A tump is a small mound, especially if it's a round barrow, which is a stone age burial place.
In Worcestershire, England, even a large barrow can be a tump, such as Whittington Tump. In fact Worcestershire loves the word tump so much that they seem to use it whenever they have the least excuse. The gorgeous unty tump is a mole hill.
For hill walkers, a tump is any hill in Britain with a prominence of over 30m. That's not very high at all, but then there are are over 16,000 of them, so covering the lot would still would make a fair walk.
A tump can also be a clump of trees, shrubs or grass.
If you're in America then a tump or tumpline is something entirely different. Here's it's a band worn just under the hairline to support a load.
That sort of tump isn't going to be an easy spot for most of us, but it might be worth trying out a homemade one as an experiment if you buy too many packs of toilet roll, say, in the supermarket.
Do let us know how you get on.
Spot the Frippet: tump. No one is sure where the word for hill comes from, but there's a Welsh word twmpath which was once applied to a mound or village green. The strap sort of tump is Algonquian. There's also a Abnaki word mádŭmbi, which means pack strap.