Sigh is related to Air. you are likely to find Butterfly in/at/on Air. 
Announce is a synonym of Publish. Publish is a synonym of Disclose. Blow is a type of Disclose. Blow is related to Big. 
Sigh <--RelatedTo--> Air <--AtLocation-- Butterfly 
Announce <--Synonym--> Publish <--Synonym--> Disclose <--IsA-- Blow <--RelatedTo--> Big 