Expandable Formatter

This module adds a field formatter that expands and collapses to obscure content that is longer than desired. It is similar in principle to Expanding Formatter, but operates in a different manner. Rather than trimming based on a number of characters, this module uses a specific height to trim the text. This results in a predictable layout every time.

How to use this module:

Enable the module and go to your content type's display settings. You will see on text-based fields (like body) that you now have the ability to choose the "Expandable" option, which will also give you options on the right to configure.