We don't have synonyms for chambon yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are charbon and champon.
(n) :
A strap that connects the girth or surcingle to rings on either side of the bridle or halter, preventing the horse from raising its head beyond a fixed point.
(n) :
A strap that connects the girth or surcingle to rings on either side of the bridle or halter, preventing the horse from raising its head beyond a fixed point.