Correct

失言

/ shīyán / 
Strokes

Definition

slip of the tongue/indiscretion/to blurt out a secret

Example

As a Verb

make an indiscreet remark; have a lapse/slip of the tongue

1
Nā
那
bùguò
不过
shì
是
yī
一
shí
时
shīyán
失言
  
。

That's just a slip of the tongue.

2
Rén
人
yǒushí
有时
nánmiǎn
难免
huì
会
shīyán
失言
  
。

A few slips of the tongue are inevitable.

3
Jiǔhòushīyán
酒后失言

make an indiscreet remark under the influence of alcohol