Final answer:
Budgetary slack occurs when a manager deliberately underestimates revenues or overestimates costs to create a cushion or safety net.
Step-by-step explanation:
The term that describes when a manager deliberately underestimates revenues or overestimates costs is budgetary slack.
Budgetary slack is the intentional padding of budget estimates to create a cushion or safety net for the manager. This allows the manager to potentially exceed targets or have resources available in case of unexpected expenses or uncertainties.
For example, a manager may intentionally underestimate revenues to lower expectations and make it easier to achieve or exceed targets. Similarly, they may overestimate costs to secure more resources than actually needed.