sway back and forth (like a pendulum)
1. Once set in motion, a pendulum will never cease to oscillate unless someone or something stops its movement.
2. sway back and forth (in a figurative sense); waver
2. He is a very indecisive person, and tends to oscillate between to possible options until his wife tells him which one he should choose.
oscillare (to swing) (Latin)
Sounds like "Oh See Late", you get late because you are not able to decide which dress to wear, red or white. So you sway back and forth to decide.