Old Birds are not caught with Chaff.

Old Birds are not caught with Chaff. Old, experienc’d and wary People are not easily to be impos’d on, or will not bite at every Bait.

Definition taken from The Universal Etymological English Dictionary, edited by Nathan Bailey (1736)

Chad * Charge [with Painters]
Burlˊesk, or Burle’sque
Caiˊsson
Caiˊsson [Gunnery]
Camel [Hieroglyphically]
Care
Carnaˊtion
Carnaˊtions [among Painters]
Caˊro [with Anatomists]
Cat-call
Ceˊntral Fire [with Chymists]
Chad
Old Birds are not caught with Chaff.
Charge [with Painters]
Charge [in Painting]
Childingness
Chum
Cirri [with Botanists]
Cleˊmency
Coˊchlea [in Mechanicks]
Collock
Coˊmet [in Heraldry]
Commoˊde