To be involved or absorbed in something to the extent of being unable to pay attention to other things.

किसी चीज़ में इतनी गहराई से जुटना की अन्य चीज़ों पर ध्यान ना दे पाना

English Usage: She was so caught up in her work that she didn't hear the phone ring.

Hindi Usage: वह अपने काम में इतनी उलझ गई कि उसने फोन की घंटी नहीं सुनी।