staunch

Adjective

• firm and dependable especially in loyalty
  • a steadfast ally
    
  • a staunch defender of free speech
    
  • unswerving devotion
    
  • unswerving allegiance
    

Verb

• stop the flow of a liquid
  • staunch the blood flow
    
  • stem the tide
    

Related words

• Synonyms: 
  steadfast , unswerving , stem , stanch , halt