English Reference
noun · verb

outflow

n. · v.
US /ˈaʊtˌfɫoʊ/ UK /aʊtflˈəʊ/ out·flow UK spelling outflowed, outflows

  1. 01 B2 Upper Intermediate

    n.the process of something flowing or moving out of a place.

    n.the process or act of flowing out; a steady movement of a substance or abstract entity away from a source.

    Simple

    The heavy rain caused a massive outflow of water from the lake into the valley.

    In context

    Engineers monitored the outflow from the reservoir to ensure the dam could withstand the seasonal pressure from melting snow.

  2. 02 C1 Advanced Academic

    n.the movement of money or assets out of a country or an account.

    n.the net reduction of capital or currency from a specific economy or financial institution.

    Simple

    The country is worried about the outflow of cash to foreign banks.

    In context

    Economists warned that the sudden outflow of capital could destabilize the national currency and lead to higher interest rates.

  3. 03 C1 Advanced Technical Science

    n.a stream of gas or material moving away from a star or the center of a galaxy.

    n.a large-scale stream of gaseous material emanating from an active galactic nucleus or a young stellar object.

    Simple

    Scientists used the telescope to study the gas outflow from the new star.

    In context

    The massive galactic outflow observed by the team suggests that the central black hole is actively clearing gas from the surrounding region.

  4. 04 C1 Advanced Formal

    v.to flow or move steadily out of something.

    v.to move in an outward direction; used intransitively to describe the motion of fluids or gases.

    Simple

    Water began to outflow from the broken pipe as soon as the pressure rose.

    In context

    As the pressure within the chamber increased, the excess steam began to outflow through the safety valves.

    emanateissuepour

But the local surfers—and many famous Malibu residents— passionately opposed the plan , fearing that changes to the outflow of Malibu Creek would alter the underwater dynamics offshore and alter the waves.

Smithsonian Magazine· 6 Aug 2026

The researchers found that these large outflows can continue even when the black hole becomes extremely faint and its activity falls to levels much lower than scientists previously expected.

ScienceDaily· 31 Jul 2026

From Middle English outflowen, from late Old English ūtflōwan (attested in the past tense as ūt flēow), equivalent to out- + flow. The noun is derived from the verb.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Old English ūtflōwan
Level C1 · Advanced
Frequency Occasional
Updated