/ˈɹʌˌnɔf/
Say it backRunoff refers to water or other materials that flow off an area, typically after rainfall or melting snow, or to a secondary election in which candidates who receive the most votes advance. It covers hydrological drainage and electoral procedures, with emphasis on flow direction, volume, and timing. The term combines run (to move swiftly) with off (away from a surface).
"The runoff from the mountain streams caused flooding downstream."
"Municipal officials studied runoff water to assess contamination risks."
"In the election, a runoff was held because no candidate won a clear majority."
Pronounce RUN-off with two syllables: /ˈrʌnˌɔf/ (US) or /ˈrʌnˌɒf/ (UK). Primary stress on RUN-. Start with /r/ as a voiced alveolar approximant, then /ʌ/ as the short, relaxed vowel in 'strut', followed by /n/ immediate nasal, then a clear /ɔ/ (US) or /ɒ/ (UK) as in 'lot', and end with /f/ as a voiceless labiodental fricative. In connected speech, the second syllable can be reduced slightly, but keep it as a distinct -off.”,
Common errors: (a) Not stressing the first syllable, leading to a flatter RUN-off; (b) Using a lifted /ɔ/ vs. /ɒ/ mismatch in US vs UK; (c) Softening the final /f/ into /v/ in some dialects. Correction tips: emphasize /ˈrʌn/ first, keep /ɔ/ or /ɒ/ as a tense, rounded vowel, then clearly release /f/. Practice minimal pairs like RUN-off vs. RUN-OF to train the final consonant. Slow down at the boundary between /n/ and /ɔ/ (or /ɒ/) to avoid blending.”,
US: rhotic /r/ in onset; stressed first syllable; /ɔ/ is unrounded back vowel. UK: non-rhotic r; /ɒ/ in second syllable often more open; Tends to shorter /ɔ/; AU mirrors US in rhotic tendencies but can be flatter. In all, the second syllable remains an off-phoneme, but vowel length and quality shift subtly: US tends toward /ɔ/ as in 'augh', UK toward /ɒ/; Australian often closer to US vowel qualities but with reduced rhoticity in careful speech.”,
Because it pairs a stressed open syllable with a rounded back vowel in the second syllable, plus a final /f/ that can bleed into a following word. The /r/ onset in US can be hard if preceding vowels soften; the second syllable requires precise tongue retraction to create /ɔ/ or /ɒ/. In rapid speech, assimilations and flapping in American English can blur /n/ + /ɔ/ into an undesired diphthong; awareness of the two-stress pattern helps prevent blending.”,
A notable feature is the two-syllable structure with a strong contrast between /n/ and the vowel of the second syllable; the /ɔ/ vs /ɒ/ difference is marked between dialects, and the /r/ if present in US tends to be pronounced with a rounded front tongue body. Also, the final /f/ can be whispered in rapid phrases; maintain voiceless labiodental fricative without voicing. Ensure a clean separation between /n/ and the following vowel—this helps avoid a fused, rapid diphthong.”]},
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Runoff is a compound of run + off, originally describing water that runs off a surface. The term appears in English from the 17th century in physical geography to denote liquid that drains away from land after precipitation. The concept widened in the 19th and 20th centuries to include runoff in meteorology and hydrology, where it describes surface runoff, as opposed to groundwater flow. The word run is Germanic in origin, tracing to Proto-Germanic runan- meaning to run or flow, while off is a preposition/adverb signifying separation. By the early 1900s, runoff had become a standard term in civil engineering and hydrology for the volume of water discharging from a watershed, as well as in politics to describe a secondary election used when no candidate achieves a majority. Over time, its usage also expanded to other fluids and from geography to electoral procedures, maintaining the core idea of something flowing away from a surface or away from the central choice. First known use traces to English writings that describe water moving off land after rain, with later formal definitions in hydrological textbooks and election law commentary.
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💡 These words have similar meanings to "runoff" and can often be used interchangeably.
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Words that rhyme with "runoff"
-off sounds
-uff sounds
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