Bounce is a type of Refuse. Refuse is a different concept from Let. Let is the opposite of Keep. 
Toilet is related to Plunge. Plunge is a synonym of Dip. Dip is related to Taste. Swallow is a type of Taste. 
Bounce --IsA--> Refuse <--DistinctFrom--> Let <--Antonym--> Keep 
Toilet <--RelatedTo--> Plunge <--Synonym--> Dip <--RelatedTo--> Taste <--IsA-- Swallow 