To move jerkily down and up
To cut short
Now he wants to bob up again.
Bob made paint, Beverly made nails.
Kiera watched Talal smile and bob another bow.
The motion of the bob of a spherical pendulum, i e.
i.): " Raise the sight, and if it keeps in line with a plumb bob, it can be as confidently relied upon as the line of metal, if the trunnions are horizontal.