labelWrap: Boolean

labelWrap specifies whether to wrap or clip label once its width crosses labelMaxWidth.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
axisX:{
    crosshair:{
        enabled: true,
	labelMaxWidth: 50,  
	labelWrap: true,
	.
	.
    }
},
 .
 . 
});
chart.render();