虎头鼠尾 (虎頭鼠尾) hǔ tóu shǔ wěi

hǔ tóu shǔ wěi set phrase a tiger's head and rat's tail; a noble start but weak finish
Domain: Idiom 成语
Notes: Variant of 虎头蛇尾 (Guoyu '虎頭鼠尾')