“Garbage” first meant the entrails and waste parts of butchered animals. Later, its meaning widened to include ordinary trash.

“Easy as pie” means very easy, but its origin is about the pleasure of eating pie, not the difficulty of making one.

Uppercase and lowercase began as real printer’s cases. Capital and small letters were stored in different drawers for hand setting type.

Quarantine began as a word for a forty day waiting period. Here is how that meaning started and why the modern use is broader.