Meanings
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1
verb
to form an arch above or extend over something
Old branches overarch the narrow path beside the river.
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2
verb
to encompass, connect, or dominate a set of details as a larger theme or structure
A concern with memory overarches all three sections of the novel.
Thesaurus
Etymology
Formed from over + arch. The literal verb describes something forming an arch above another thing; the common figurative sense treats a broad principle or theme as a structure spanning many smaller parts.