the.com/opposition
The professional art of disagreeing with whoever currently holds the keys.
means A person or group that resists, competes against, or formally challenges those in power.
from From Latin oppositus, past participle of opponere — to set against, literally to place in front of as an obstacle.
AstronomyA planet directly opposite the sun in our sky.
PoliticsGovernments-in-waiting, paid to criticize and prepare.
ChessKings facing off control who must blink first.