rubber stamp Definition

1. A device made of rubber with figures, letters, names, etc marked on it, used to stamp a name, date, etc on books or papers.
2. An automatic, unthinking or routine agreement or authorization.
3. A person or group of people required to approve or authorize the decisions or actions of others, but who do not have the power, courage, etc to withold this approval or authorization.

1. To mark something with a rubber stamp.
2. colloq
To approve or authorize something automatically, unthinkingly or routinely.