More cleartext in the MS?

[Searcher]

Maybe it's "fond".

2. it's a french expression.
"à fond" = fully, thoroughly.
I doubt that this expression was used in 15th century.

As well, adverb "a fond" means "to the bottom", as initial meaning, that became "fully" and "exactly". 
It existed in XVI c., possibly, already was used in XV c.
Aller à fond, couler à fond (Termes de Mer ) - To sink, to go down to the bottom.
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