The big stick
Definition 1 of 1
Pro Tip 1/3Political Power
It often refers to a nation's display of military strength or economic pressure on others. 
The UN doesn't shy away from using the big stick in the form of sanctions.
Pro Tip 2/3Implied Threat
Used to hint at power behind diplomacy without displaying it openly. 
The prime minister's stance is patient, yet the big stick remains firmly in his grip.
Pro Tip 3/3Teddy Roosevelt
The phrase is famously attributed to Theodore Roosevelt's foreign policy: 'Speak softly, and carry a big stick.' 
Modern leaders often cite Roosevelt's big stick policy as an influence.