hollow
n. countablen. a small, low area of land or a hole inside something. You might find a hollow in a tree or a quiet hollow between two hills.
n. a small valley or a depressed area on a surface; also a cavity or space within a solid object. Often used in topographical descriptions to denote a sheltered, low-lying spot.
The rabbit disappeared into a hollow under the tree.
We built our campfire in a small hollow to protect the flames from the strong mountain wind.
The ancient oak tree featured a deep hollow where several generations of owls had nested, sheltered from the harsh winter storms that swept across the valley floor.
From Middle English holow, holowe, holwe, holwȝ, holgh, from Old English holh (“a hollow”), from Proto-West Germanic holh, from Proto-Germanic hulhwą, perhaps from Proto-Indo-European *ḱólḱwos. Cognate with Old High German huliwa and hulwa, Middle High German hülwe. Related to hole.
From Middle English holowe, holwe, holuȝ, holgh, from the noun (see above).
Compare holler.
Often used with the preposition 'in' or 'into'.