Crew is related to Short. Short is a synonym of Shallow. Shallow is a synonym of Weak. 
Fear is related to Big. Big is related to Sigh. Sigh is related to Breath. 
Crew <--RelatedTo--> Short <--Synonym--> Shallow <--Synonym--> Weak 
Fear <--RelatedTo--> Big <--RelatedTo--> Sigh <--RelatedTo--> Breath 