Definition of busk-board in US English:

busk-board

noun

Bell-ringing
rare
  • A piece of wood forming part of the apparatus used to attach the clapper to a bell.

Origin

Mid 19th century; earliest use found in Notes and Queries. Probably from busk + board, perhaps with allusion to a similarity in form between this component and a corset busk, or perhaps with reference to the restraining or bracing function they both perform.

Pronunciation

busk-board

/ˈbʌskbɔːd/