The thumb is a symbol of power. In ancient Rome, when a gladiator was defeated in a contest, the thumb was used to indicate whether his life should be spared. Thumbs up and he lived; thumbs down and he died. Thus, the thumb had the power of life and death.
If you see a thumb in a dream, you are being reminded of how much power you really have. If you feel that you have lost a control of a situation, your dream is telling you that you have the ability to take charge again. In real life,we use thumbs to grasp things – a symbol of physical control.
A thumb pointing upward in a dream is a sign of positive energy, while a downward-pointing thumb symbolizes negative energy.