A lock with a hinged U-shaped hook that you use to chain your bike to the bike rack is an example of a padlock.
When you wrap chains around the doors of your storage shed and you then secure the chains with a U-shaped lock so they cannot be removed, this is an example of when you padlock your shed.
Origin of padlock
- Middle English padlok pad- of unknown meaning lok lock lock1
From American Heritage Dictionary of the English Language, 5th Edition