$descrr = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."



$descrr = stripslashes($_POST['descr']);

$insert = mysql_query("insert into offer(
    descr
    ) 
    values(
    '".$descrr."'
    )")
    or die(mysql_error($con));

Error while inserting description text:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 's standard dummy text ever since the 1500s, when an unknown printer took a galle' at line 4

Your text contains an apostrophe (') which is also used in mysql as a string delimiter. In order to store an apostrophe into the DB you have to escape it usually using a database escape function (mysql_real_escape_string in your example):

$insert = mysql_query("insert into offer(
descr
)
values(
'".mysql_real_escape_string($descrr)."'
)")
or die(mysql_error($con));

All in all using deprecated mysql_* functions is a bad idea. Switch to PDO.

Solved

while instering i used
$descrr = mysql_escape_string(trim($_POST['descr']));

while displaying
$descrr = stripslashes($row['descr']));