Correct

前脚

/ qiánjiǎo /
Strokes

Definition

one moment ..., (the next ...)/leading foot (in walking)

Example

As a Noun

forward foot in a step

1
Qiánjiǎo
前脚
huá
  
,
hòujiǎo
后脚
zhàn
wěn
  

As the front foot slipped, the rear foot became unsteady.

As an Adverb

[used together with后脚]no sooner ... than; the moment (when)

2
Zhēn
qiǎo
不巧
  
,
qiánjiǎo
前脚
zǒu
  
,
hòujiǎo
后脚
jiù
dào
liǎo
  

Too bad, he arrived soon after you left.

Related

前脚后脚