to be infatuated with someone, to be head over heels for someone
Jemanden blindlings oder unvernünftig lieben, bewundern oder für jemanden völlig verknallt sein.
To love or admire someone blindly, often losing one's senses.
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Er hat wohl einen Narren an ihr gefressen.— He seems to be completely infatuated with her.
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Man merkt sofort, dass er einen Narren an seinem neuen Chef gefressen hat.— It's immediately obvious that he is totally smitten with his new boss.