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a declaration made by a bettor in certain gambling games, as baccarat and chemin de fer, indicating a bet matching the full amount in the bank, to the exclusion of all previous lower bets: often used as an interjection.
to make such a declaration.
Contemporary Examples

It began harmlessly enough, with a call from the manager of banco Bilbao in Malaga, who asked Schiller to stop by.
The Billionaire and the Fugitive Meir Doron, Joseph Gelman July 22, 2011

Citibank restructured the banco Hipotecário, and paid back the $43 million loan four years before it was due.
In Bolivia, Serving a Prior Government Can Make You a Political Prisoner Mac Margolis December 28, 2011

Historical Examples

In a flash he remembered the banco on the lake, the other sounds he had heard.
The Adventures of Piang the Moro Jungle Boy Florence Partello Stuart

He searched his banco for his bow and arrows, but was astonished to find only the bow.
The Adventures of Piang the Moro Jungle Boy Florence Partello Stuart

The money in use was silver, with a small paper circulation of banco Espagnol-Filipino notes.
A Woman’s Impression of the Philippines Mary H. (Mary Helen) Fee

And do not remain in banco, or Padre Diego will surely make you trouble.
Carmen Ariza Charles Francis Stocking

The Hamburg banco was, therefore, appreciated above the Hamburg courant by a matter of 22.5225 per cent.
The History of Currency, 1252 to 1896 William Arthur Shaw

The question of the agio of the Hamburg banco system belongs rather to the history of banking.
The History of Currency, 1252 to 1896 William Arthur Shaw

In 1904 the position of the “banco Español-Filipino” (vide p. 258) was officially discussed.
The Philippine Islands John Foreman

They paddled fast, down to the Boque river; then to the Magdalena; and down here to banco.
Carmen Ariza Charles Francis Stocking

interjection
a call in gambling games such as chemin de fer and baccarat by a player or bystander who wishes to bet against the entire bank