know different/otherwise

know different

To understand or be certain that a particular opinion is unfounded or incorrect. There's a common perception that being a stay-at-home parent is the easy option, but I know different.
See also: different, know

know otherwise

To understand or be certain that a particular opinion is unfounded or incorrect. There's a common perception that being a stay-at-home parent is the easy option, but I know otherwise.
See also: know, otherwise

know ˈdifferent/ˈotherwise

(informal) have more information about something: She thought he was upset about the divorce, but I knew different.