* General meaning: The drainage system in the city was overwhelmed by the heavy rainfall.
* Referring to a specific system: The homeowner installed a new drainage pipe to prevent flooding in the basement.
* Figurative meaning: The constant negativity in the office was a drainage on everyone's morale.
* Medical context: The doctor recommended surgery to improve the drainage from the infected wound.
* Environmental context: The deforestation led to poor drainage and increased erosion.
Remember, "drainage" can be a noun or a verb.