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Dumbfound : 

Make somebody speechless: to make somebody temporarily speechless with astonishment.

syn : astonish, amaze, astound, surprise, stagger, flabbergast (informal), confound, stunned.

Freak out :

Make or become upset : To become extremely upset or agitated, or make somebody so.
syn : be frightened, be terrified, lose your nerve.

Vogue:

Prevailing fashion or popularity.
syn : fashion, trend, craze, rage.

Savvy:

Shrewdness and practical knowledge.
syn : shrewness, practicality, knowledge