The act of covering or filling with smoke; present participle of besmoke.
From besmoke plus -ing, creating the continuous aspect.
Gerunds can become quite poetic—'the besmoking of the battlefield' creates a more vivid mental image than 'smoke covered the battlefield.' It's why military histories and adventure novels favor these archaic -ing forms.
Complete word intelligence in one call. Free tier — 50 lookups/day.