While blaaf has written a good general overview on the topic, here's a little more detail on various blood alcohol concentrations and their effects.

Check the pipelinks for explication

Bac (?), n. [F. See Back a vat]

1.

A broad, flatbottomed ferryboat, usually worked by a rope.

2.

A vat or cistern. See 1st Back.

 

© Webster 1913.

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