Correct

插脚

/ chājiǎo /
Strokes

Definition

to shove in/to edge in/fig. to poke one's nose into people's business/prong

Example

As a Verb

have a foothold (in a room, etc); step inside; set foot in

1
táng
大礼堂
fēicháng
非常
yōng
拥挤
  
,
无法
chājiǎo
插脚
  

The auditorium is very crowded that I cannot step inside.

As a Verb

take part in; participate/partake in

2
men
他们
自己
zhī
组织
zhèxiē
这些
huódòng
活动
  
,
zuìhǎo
最好
biè
chājiǎo
插脚
  

They organize these activities and you'd better not butt in.

As a Noun

pin; base pin; prong; limb