You can suspend a hold so it does not become available for checkout while you are unable to pick it up. When you suspend a hold, you continue to move up in the hold list, but the hold will not be filled for you until the date you specify (or later if you have not reached the top of the holds list or a copy has not become available yet).
For physical titles:
For digital titles from OverDrive:
NOTE: If you want to cancel or change the date on the suspension, revisit your holds list and click Re-activate under the title to cancel your suspension or Change next to the date to edit the date.