Wiktionary
underbracing
vb. (present participle of underbrace English)
Usage examples of "underbracing".
The shipyards, however, were a hive of activity, the wrights working throughout the nights as well as the days: fifty of the Dragonships were measured and fitted thwartwise with wide, raftlike sections of heavy planks pinned to the underbracing, to span across from topwale to topwale and jut a yard beyond either side.