On the nod
Definition 1 of 2
Pro Tip 1/3Implicit Trust
Used when someone is trusted to decide without others questioning. 
Since he's an expert, we took his advice on the nod.
Pro Tip 2/3Decision Easiness
Indicates that a proposal or suggestion was easily agreed upon. 
The budget increase was allowed on the nod, surprisingly.
Pro Tip 3/3No Debate
Highlights that something was agreed to without any debate or resistance. 
The team accepted the changes on the nod, no questions asked.