maintain

To continue to have or possess something; to keep something in existence or at a certain level, condition, or standard. It can also mean to strongly state or assert that something is true, or to provide someone with money and the basic necessities of life.

• It's challenging to maintain a healthy weight without regular exercise.
• The peacekeepers worked tirelessly to maintain order in the conflict zone.
• Despite overwhelming evidence, she continued to maintain her innocence.
• He works hard to maintain his family, ensuring they have everything they need.

This is a very rare or archaic noun form of the verb "maintain". It refers to the act or means of keeping something in good condition or existence, or providing for the support of someone or something (similar to upkeep or sustenance). For example, the maintain of a building refers to its maintenance. Additionally, in a more abstract or specific sense, it can refer to the act or state of asserting or upholding a particular idea, argument, or position. This conceptual nuance often lacks a single, direct noun equivalent in Spanish, typically requiring a descriptive phrase such as 'la defensa de una idea' (the defense of an idea) or 'el sostenimiento de un argumento' (the upholding of an argument).

• The old castle required constant maintain to prevent its decay.
• His small pension provided barely enough for his maintain in the city.
• Her unwavering maintain of her core principles defined her career.