Build up and deplete are opposites that act on a store. Build up means to increase or strengthen something gradually — you build up reserves, savings, strength and stamina. Deplete means to use up a supply, draining it down faster than it is replaced — you deplete reserves, resources, energy. One adds to a store and strengthens it; the other draws it down to empty.
Build up raises a store course by course; deplete bleeds it away. You build up reserves in good times and deplete them in bad; an athlete builds up stamina over months and depletes it in a single hard race. From the everyday phrasal verb and deplere ('to un-fill'), they are clean opposites: one replenishes and grows a holding, the other empties it.
build up
To build up is to increase or strengthen something step by step until it amounts to something solid — reserves, muscle, momentum, a reputation, or the tension before a release. It is the hands-on, everyday twin of accumulate: where things accumulate almost on their own, you build up by adding deliberately, one layer onto the last. The phrasal verb leans toward development and strength, and it cuts both ways — you can build up savings and stamina, or let pressure build up until something finally gives.
deplete
To deplete is to empty by use — the Latin deplere, 'to un-fill', is the exact mirror of 'replete' and 'complete', which share its root plere, 'to fill'. The word is quietly mathematical: fish stocks, aquifers, savings, and stamina all deplete when the rate of taking outruns the rate of return. Nothing dramatic happens at any single moment — that is depletion's danger; each withdrawal looks exactly like the last one, except that eventually nothing stands behind it.
| build up | deplete | |
|---|---|---|
| Meaning | increase, develop or strengthen gradually | use up a supply, drain it down |
| Direction | adds to a store, strengthens | drains a store, empties |
| The level | climbs course by course | falls to empty |
| Often with | reserves, savings, strength, stamina | reserves, resources, energy, savings |
| Noun | buildup | depletion |
| Example | She built up her reserves. | The crisis depleted them. |
They are opposites — replenish vs drain. Build up is the brick wall: a store raised steadily, layer on layer (build up reserves, build up strength). Deplete is the draining battery: a finite supply used up until it scrapes empty (deplete reserves, deplete resources). If a store is raised and strengthened, it builds up; if it is drawn down to nothing, it is depleted.
build up
- iThe country built up its foreign reserves.
- iiHe built up his strength after surgery.
- iiiThey built up a cushion of savings.
deplete
- iThe recession depleted those reserves.
- iiHard training without rest depletes the body.
- iiiYears of drought depleted the reservoir.
They are antonyms acting on a store: build up raises and strengthens it; deplete drains it down. The same reserves you build up in good years can be depleted in a crisis. Build up is the steady replenishing; deplete is the using-up.