Meaning is related to Definition. Definition is related to Sound. Sound is related to Pressure. 
Mouth is related to Drink. Drink is related to Act. Discovery is a type of Act. Discovery is related to Shock. 
Meaning <--RelatedTo--> Definition <--RelatedTo--> Sound <--RelatedTo--> Pressure 
Mouth <--RelatedTo--> Drink <--RelatedTo--> Act <--IsA-- Discovery <--RelatedTo--> Shock 