Move the Axis Title

To move the axis title down so both the axis labels and axis text don’t overlap you can use the following code:

axis: {
    y: {
              text: "Prices",
              textStyle: {
                       translation: "0 20"
              },
              labels: {
                       style: {
                                   translation: "0 0"
                          }
              }
     }
}