to gradually fail, end, or become less intense

to lose power or strength

शक्ति या ताकत खोना

English Usage: His enthusiasm for the project fizzled out after the first few weeks.

Hindi Usage: पहले कुछ हफ्तों के बाद, उसके प्रोजेक्ट के प्रति उत्साह खत्म हो गया।