D-Murray- here are a few more-
“Knuckling down”- In marbles, it is getting ready to shoot, but in general terms, it means getting down to work or the task at hand.
“Going for all the marbles”- used is almost every championship game as a metaphor for each team’s efforts to win.
“Gettin down and dirty”- in marbles, it means kneeling down in the dirt to play seriors. In other terms, it means getting serious about what you are doing.