on shaky ground

US /ɑn ˈʃeɪki ɡraʊnd/
UK /ɑn ˈʃeɪki ɡraʊnd/
"on shaky ground" picture
1.

sur un terrain instable, en position précaire

in an uncertain or unstable position; likely to fail or be challenged

:
His argument was on shaky ground because he lacked sufficient evidence.
Son argument était sur un terrain instable car il manquait de preuves suffisantes.
After the scandal, the company's reputation was on shaky ground.
Après le scandale, la réputation de l'entreprise était sur un terrain instable.