bummock

Meanings

1. A brewing of ale.
2. A submerged, downward-projecting piece of ice.

Etymology

For the sense relating to alcohol: from or cognate to Scots bummock (“a brewing of drink; the liquor so brewed”), perhaps from Scots bummie, bummo, a vessel for holding liquid, itself perhaps from Old Norse, compare Icelandic bumba (“drum”). For the sense relating to ice, perhaps compare how keel can mean either a similar ice structure or a brewer's vat.