Click-To-Copy on a Collapsible Definition List issue - list

Question

I have a "collapsible" definition list.
For each item of the list, I have added a Click-To-Copy button to the definition term for it to copy the paragraph text of each term .
The problem is that everytime I click on the Click-To-Copy button, it automatically expands (or collapses) the paragraph, and I do not want it to do that.
I want the paragraph to be expanded (or collapsed) only when I click on the text of the definition term, but not when I click on the button within the definition term element.
/* Collapsible Definition List usando jQuery */
(function( $ ){
$.fn.collapsible_definition_list = function() {
return this.each(function(){
$(this).find('dd').hide().end().find('dt').addClass("more").bind({
click: function(){
$(this).toggleClass("more less");
$(this).nextAll().each(function(){
if($(this).is('dt')){
return false;
}
$(this).slideToggle();
});
}
});
});
};
})( jQuery );
$(document).ready(function(){
$('.collapsible').collapsible_definition_list();
});
/* Here is the code for the click to copy: */
function copyToClipboard(element) {
var $temp = $("<textarea>");
var brRegex = /<br\s*[\/]?>/gi;
$("body").append($temp);
$temp.val($(element).html().replace(brRegex, "\r\n")).select();
document.execCommand("copy");
$temp.remove();
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<dl class="collapsible">
<dt><button onclick="copyToClipboard('#p1')">Click to Copy</button> Item 1</dt>
<dd id="p1">Test text 1.<br>This is paragraph #1</dd>
<dt><button onclick="copyToClipboard('#p2')">Click to Copy</button> Item 2</dt>
<dd id="p2">Test text 2.<br>This is paragraph #2</dd>
<dt><button onclick="copyToClipboard('#p3')">Click to Copy</button> Item 3</dt>
<dd id="p3">Test text 3.<br>This is paragraph #3</dd>
</dl>
What can I do so that clicking on the click-to-copy button does not activate the collapse/expand feature of the definition term element?
(just in case, be nice with me if I am doing something incorrectly... I've done this empirically)