the GNU version of the Collaborative International Dictionary of English
v. To make or place an arch over; to hang over like an arch.
The Century Dictionary and Cyclopedia
To cover with or as with an arch.
To form into an arch above.
To hang over like an arch.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. be central or dominant
v. form an arch over
Word Usage
"Old chestnut trees overarch it from the terraces, and its floor, thick with their dried, toasty leaves, is littered with the hedgehog shells of chestnuts."