[ duhb-uh l-bot-uh m ]
/ ˈdʌb əlˌbɒt əm /
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for double-bottom
This “double-bottom,” also called a “sluiceboat” or “cylinder,” was later lengthened at the stern to make her 30 feet overall.