The more business he got, the greater his power seemed to grow of getting at its pith and marrow; and however late at night he sat carousing with Sydney Carton, he always had his points at his fingers’ ends in the morning.
There are no more uses of "carouse" in the book.
Show samples from other sources
They were out carousing last night.
...one night, as he was carousing among drunken companions, a letter was put into his hand.