From Middle English belwen, from Old English bylgian, ultimately from the Proto-Indo-European *bʰel-, whence also belg ("leather bag"), bellan ("to roar"), blāwan ("to blow").

• (America) IPA: /ˈbɛloʊ/
• (RP) IPA: /ˈbɛləʊ/

bellow (plural bellows)

1. The deep roar of a large animal, or any similar loud noise.
   • 1912, Arthur Conan Doyle, The Lost World […], London; New York, N.Y.: Hodder and Stoughton, →OCLC ↗:

     There was a tap at a door, a bull's bellow from within, and I was face to face with the Professor.

• German: Röhren, Brüllen
• Italian: ruggito
• Russian: рёв
• Spanish: bramido, berrido

bellow (bellows, present participle bellowing; simple past and past participle bellowed)

1. To make a loud, deep, hollow noise like the roar of an angry bull.
   • 1697, Virgil, “The First Book of the Georgics”, in John Dryden, transl., The Works of Virgil: Containing His Pastorals, Georgics, and Æneis. […], London: […] Jacob Tonson, […], →OCLC ↗:

     the bellowing voice of boiling seas

2. To shout in a deep voice.

• French: mugir
• German: brüllen, röhren
• Italian: muggire, ruggire
• Portuguese: bramir, rugir, urrar
• Russian: рыча́ть
• Spanish: bramar, berrear

• French: beugler
• German: brüllen, grölen
• Russian: реве́ть
• Spanish: bramar

Metonymic occupational surname for a bellows maker.

1. Surname.