/əˈbaʊnd/
[verb] To exist in very large numbers or amounts; to be full of something. If a place abounds with something, there is a great deal of it there.
'Abound' secretly contains the Latin word for 'wave' — meaning to overflow like water flooding its banks.
The story of 'abound' begins with water. Deep in its roots lies the Latin word 'unda', meaning 'wave' or 'flowing water'. The Romans built from this a verb, 'abundare', which meant literally 'to overflow' — as a river swells beyond its banks after heavy rain and spills across the surrounding land. That prefix 'ab-' (sometimes 'ad-') simply intensified the idea, giving the whole word the sense of surging, overflowing richness. It was a beautifully physical metaphor: to have so much of something that it pours over the edges.
From 'abundare', Latin also produced 'abundantia', meaning a great supply or plenty. This gave English not only 'abound' but the closely related 'abundance' and 'abundant', arriving through Old French 'abondance' and 'abondant'. The chain runs clearly: Latin 'abundare' → Old French 'abonder' → Middle English 'abounden'. You can see the same ancient root 'unda' rippling outward into 'undulate' (to move in waves), 'inundate' (to flood or overwhelm), and even 'surround' (Latin 'superundare', to overflow over the top).
The word entered Middle English in the 14th century, appearing in texts from around the 1340s onwards. Writers of that era used it in ways that kept the watery, overflowing flavour alive — describing lands that 'abound' in grain, rivers that abound in fish, or kingdoms blessed with wealth that seemed to pour forth without limit. Geoffrey Chaucer and later the writers of the King James Bible (1611) helped fix the word firmly in the English literary tradition, giving it a slightly grand, formal feel that it still carries today.
Over time, the meaning softened and broadened. While the original sense was almost physical — an image of liquid spilling over a container — 'abound' gradually came to mean simply 'to be plentiful' or 'to be full of', without necessarily suggesting overflow. A forest abounds with wildlife; a novel abounds with ideas; a city abounds with history. The water imagery faded into the background, but the essential meaning — richness, plenty, more than enough — survived perfectly intact.
What is perhaps most striking is how the same Latin root 'unda' quietly shaped so many ordinary English words. 'Redundant' comes from Latin 'redundare', meaning 'to overflow again' (re- meaning 'back' or 'again'), so something redundant was once, quite literally, something that kept spilling over — excessive and unnecessary. Latin 'abundare' → Old French 'abonder' → English 'abound', while Latin 'redundare' → Old French 'redonder' → English 'redundant'. One small Latin word for a wave created a whole tide of English vocabulary describing excess, fullness, and plenty.