You don't swing in a hummock, you climb one. A hummock is a hill, a mound, or a ridge.

This word was once a nautical term describing a hill rising up on a coastline. A hummock is a perfect place for a lighthouse. Today it is either a rounded hill or an elevated place in an ice field. The origin of the word is unknown, but the ending -ock is a diminutive, meaning it gives the noun the sense of being small. That is why a hummock is a knoll and not a mountain.

Definitions of hummock

n a small natural hill

hammock, hillock, knoll, mound
anthill, formicary
a mound of earth made by ants as they dig their nest
kopje, koppie
a small hill rising up from the African veld
a mound of earth made by moles while burrowing
Type of:
a local and well-defined elevation of the land

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