idiom · highly embellished and ineffectual; fancy but impractical skills or appearance that lacks substance.

这项工程得有实实在在的进展，不能只搞花拳绣腿。

idiom · flowery fist and fancy footwork; superficial martial arts techniques that look impressive but lack practical combat power.

他练的功夫全是花拳绣腿，中看不中用。