maintain - verb

• keep in a certain state, position, or activity; e.g.,
• keep in safety and protect from harm, decay, loss, or destruction
• supply with necessities and support
• state categorically
• have and exercise
• maintain for use and service
• maintain by writing regular records
• state or assert
• support against an opponent
• stick to correctly or closely

maintain - thesaurus

assert   asseverate   conserve   defend   exert   hold   keep   observe   preserve   sustain   uphold   wield