only have eyes for (someone/something)

to be interested in just one person or thing.

They only had eyes for each other.

A hunter has eyes only for the animal being hunted.

• a whip-round
• a whistle-blower
• a whistle-stop tour
• a white elephant
• a white knight
• a white lie
• a whizz-kid
• a whole new ballgame
• a whole new ball game
• a wide boy
• a wild card
• a wild-goose chase
• a wise guy
• a wish list
• a witch-hunt
• a wolf in sheep's clothing
• a wolf whistle
• a woman after own heart
• a woman after your own heart
• a woman of means
• a woman of the world
• a word to the wise.
• a word to the wise is sufficient.
• a world of difference
• a worm's eye view