Do not trust him, he is a known knight of the post.
knight of the post
idiomA known perjurer; a professional false witness.
Origin
disputed originSuggesting that such a person would be familiar with the whipping-post or pillory.
The lawyer refused to call the man to the stand because he was a notorious knight of the post.
The judge dismissed the testimony immediately, recognizing the witness as a common knight of the post who sold his lies to the highest bidder.
- 01
be left at the post
To be beaten from the beginning of a competition or race.
- 02
dumb as a post
Utterly mute; lacking the ability to speak.
- 03
far post
The goalpost furthest from where a cross is made.
- 04
from pillar to post
From one place, place, or thing to another, hither and thither.
- 05
near post
The goalpost nearest from which a cross is made.
- 06
pip to the post
To overcome a strong competitor in a sporting event, especially by gaining a small advantage at the last decisive moment.