the momentary juggling of a batted or thrown baseball
"the second baseman made a bobble but still had time to throw the runner out"
A furry ball attached on top of a hat.
"He reached up to adjust his red wool cap, making sure the fluffy white bobble stayed centered over his forehead."
make a mess of, destroy or ruin
"I botched the dinner and we had to eat out"
"the pianist screwed up the difficult passage in the second movement"
To bob up and down.
"The loose ball of yarn began to bobble up and down on the floor where it had fallen."