Trebling
The Century Dictionary and Cyclopedia
noun.
The planks put on a vessel's bow as strengthening pieces to enable it better to withstand the pressure of ice.
Wiktionary, Creative Commons Attribution/Share-Alike License
verb.
Present participle of
treble
.
Word Usage
"Since joining the coalition government, the Liberal Democrats have faced criticism for breaking a number of pre-election pledges, namely trebling the cap on university tuition fees and increasing sales tax."