* A nod is as good as a wink. This is a common idiom that implies understanding without explicit communication.
* A gesture is enough. This is a more literal translation.
* Just a hint will do. This emphasizes the subtlety of the communication.
* A sign is sufficient. This is a more formal option.
* It's understood without words. This focuses on the implicit nature of the communication.
The best choice will depend on the specific situation. If you can provide the context, I can give you a more precise translation.