HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hide submenu</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #nav-item { display: inline-block; position: relative; padding: 10px 16px; background: #f1f5f9; border: 1px solid #cbd5e1; border-radius: 6px; cursor: default; }
    #submenu { display: none; position: absolute; top: 100%; left: 0; margin-top: 4px; background: #fff; border: 1px solid #e2e8f0; border-radius: 6px; min-width: 140px; box-shadow: 0 4px 12px rgba(0,0,0,0.08); z-index: 1; }
    #submenu a { display: block; padding: 8px 14px; color: #334155; text-decoration: none; }
    #submenu a:hover { background: #eef2ff; }
    #hint { margin-top: 12px; color: #64748b; font-size: 14px; max-width: 360px; line-height: 1.5; }
  </style>
</head>
<body>
  <div id="nav-item">
    Products
    <div id="submenu">
      <a href="#">Widgets</a>
      <a href="#">Gadgets</a>
    </div>
  </div>
  <p id="hint">Enter nav item — submenu shows. Leave entirely — mouseleave hides it. Moving into submenu stays inside.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#nav-item")
      .on("mouseenter", function() {
        $("#submenu").show();
      })
      .on("mouseleave", function() {
        $("#submenu").hide();
      });
  </script>
</body>
</html>

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jQuery mouseleave — hide submenu (Try It)