Answer:

The best way to control your excerpts is to use the More tag, however in widgets and some templates, the excerpt may be auto-generated which will not recognize your More tag. You can customize the drop-off for excerpts with a custom function.

This is considered a modification, so do it at your own risk! Make a backup of your existing file so you can replace it if something goes wrong and you need to start over.  Modified files WILL probably be replaced by a theme update at some point so keep note of your changes for future reference. Please note that we cannot assist you with modifying your theme or support problems you encounter as a result!

By default, excerpt more string at the end is set to ‘[…]’. To change excerpt more string using excerpt_more filter, add the following code to functions.php file in your theme:

function new_excerpt_more( $more ) {
	return '[.....]';
}
add_filter('excerpt_more', 'new_excerpt_more');

Where […..] is whatever you want to appear  the end.