lock in

Verb

• place in a place where something cannot be removed or someone cannot escape
  • The parents locked her daughter up for the weekend
    
  • She locked her jewels in the safe
    

• close with or as if with a tight seal
  • This vacuum pack locks in the flavor!
    

Related words

• Synonyms: 
  lock away , lock , put away , shut up , shut away , lock up , seal in