from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To burp.
- v. To retch or vomit.
From Middle English bolken ("to vomit, overflow"), from Old English bealcan ("to belch, utter, bring up, sputter out, pour out, give forth, emit, come forth"), from Proto-Germanic *belkanan (“to belch”). Cognate with Dutch balken & bulken ("to bellow"), German bölken ("to roar"). See also belch. (Wiktionary)