Correct

旋踵

/ xuánzhǒng /
Strokes

Definition

to turn on one's heel/in the twinkle of an eye/instantly

Example

As an Adverb

instantly; immediately; quickly

1
Xuánzhǒngjíshì
旋踵即逝

vanish in a flash

2
Xuánzhǒngérzhì
旋踵而至

arrive immediately