underflow
noun, verb
underflow is spelled U-N-D-E-R-F-L-O-W: 9 letters. It appears about once in every 20 million words in written English, the 134,976th most frequent word form (wordfreq, 2021 data). As a noun, underflow means “A current flowing below the surface” (English Wiktionary, September 2026). The plural of underflow is underflows.
How many letters and syllables are in underflow?
| Letters | 9: U-N-D-E-R-F-L-O-W |
|---|---|
| In writing | about once in every 20 million words; the 134,976th most frequent word form |
| Wrong spellings searched | none measured in search |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is underflow?
Underflow appears about once in every 20 million words in written English, the 134,976th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce underflow?
- US
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Flame,_not_lame-underflow.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with underflow?
No other word on PlainSpell ends in the same sounds as underflow.
Spelled with the same letters in another order: wonderful.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of underflow
- underflows plural, present, singular, he/she/it
- underflowing participle, present
- underflowed participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does underflow mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A current flowing below the surface.
- 2
A condition in which the value of a computed quantity is smaller than the smallest non-zero value that can be physically stored; usually treated as an error condition.
- 3
The error condition that results from an attempt to retrieve an item from an empty stack.
verb
- 1
To trigger the condition in which the value of a computed quantity is smaller than the smallest non-zero value that can be physically stored.
- 2
To trigger the error condition resulting from attempting to retrieve a value from an empty stack.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does underflow come from?
From under- + flow, modelled on overflow.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).