The manager became power-mad, constantly forcing employees to work late into the night.

power-mad 是由 power（权力）和 mad（疯狂的）组成的复合形容词。power 指"权力、力量"，mad 本义是"疯狂的"，引申为"极度迷恋的"。 power-mad 形容一个人对权力极度迷恋甚至疯狂的状态，通常带有贬义，指滥用权力或过度追求权力的行为。