to diminish gradually in size, amount, or strength

धीरे-धीरे आकार, मात्रा, या शक्ति में कमी आना

English Usage: As the day went on, his enthusiasm began to dwindle away.

Hindi Usage: जैसे-जैसे दिन बीतता गया, उसकी उत्साह धीरे-धीरे कम होता गया।