a flash in the pan
US /ə flæʃ ɪn ðə pæn/
UK /ə flæʃ ɪn ðə pæn/

1.
kejayaan sementara, fenomena sekejap
a sudden but brief success or a person who achieves it
:
•
Many people thought his first hit song was just a flash in the pan, but he went on to have a successful career.
Ramai orang menyangka lagu hit pertamanya hanyalah kejayaan sementara, tetapi dia terus membina kerjaya yang berjaya.
•
We need consistent performance, not just a flash in the pan.
Kita memerlukan prestasi yang konsisten, bukan hanya kejayaan sementara.