In reading a poem by Kipling, I encountered a phrase I do not understand:


The Ballad of the 'Bolivar'


Felt her hog and felt her sag, betted when she'd break;
Wondered every time she raced if she'd stand the shock;
Heard the seas like drunken men pounding at her strake;
Hoped the Lord 'ud keep his thumb on the plummer-block.

What do the last two words mean? I looked up nautical terms in Internet, could not find it;.

I finally found a glossary that translates "plummer block" into four foreign languages!
plummer block=saft yatagi=Stevenrohr= tube d'étambot= bocina