How to expand trimmed messages

Gmail has a feature that hides the bottom part of long messages, especially in Replies and Digests.  You cannot turn this feature off. Instead, you can click a button to expand the entire message.

What will a trimmed message look like?

Example 1

A small, grayed-out box with 3 dots may appear in the middle of the message.

If you see a small grayed out box with three dots in the middle of your message

Example 2

The words [Message clipped] View entire message may be listed.

Or if you see [Message clipped] View entire message

What do I do?

Click on the grayed-out box with 3 dots or click View entire message to expand the hidden text.

You can also collapse the extra text by again clicking the 3 dots.