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 statement or assertion 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
Farlex Dictionary of Idioms.

know ˈdifferent/ˈotherwise

(informal) have more information about something: She thought he was upset about the divorce, but I knew different.
See also: different, know, otherwise
Farlex Partner Idioms Dictionary
See also:
  • know different
  • know otherwise
  • otherwise
  • stay-at-home dad
  • stay-at-home mom
  • wear several hats
  • SAHD
  • SAHM
  • wear two hats
  • wear two hats (more than one hat), to