Denshi Jisho — Online Japanese dictionary

みはる to open one's eyes wide
Godan verb with ru ending, Transitive verb 
どうもく gazing at (in wonderment)
Noun, Suru verb 
どうじゃく being dumbfounded
Na-adjective, Noun 
若たらしめる どうじゃくたらしめる to strike someone dumb with astonishment
Ichidan verb 

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