To make (someone or something) neat, tidy, or stylish, often with the particle “up”. They spruced the cabin up before the holidays.
To make oneself neat or smart in appearance; to smarten up (usually with “up”). He went to the washroom to spruce up before the presentation.
To make oneself neater or tidier; to smarten up. He took a moment to spruce up before heading out for dinner.