Earphone definition, a sound receiver that fits in or over the ear, as of a radio or telephone. See more.
Answer Wiki. If a rocket went straight up, it would either continue in that direction and leave Earth, or it would fall back down, depending on its velocity. Most rockets intend to enter orbit, which is an elliptical trajectory, and it's much more efficient to arc into this trajectory than to go straight up and then accelerate laterally.
Never mind that it was you who decided to start the pushing in the first place; you can't push on the ball without having the ball push back. Forces always come in pairs. Of course, rockets work on more sophisticated principles than just tossing fuel out the back.