contrary to popular belief/opinion

something that you say before you make a statement that is the opposite of what most people believe.

Contrary to popular belief, bottled water is not always better than tap water.

• be out in force
• be out in left field
• be out like a light
• be out of action
• be out of bounds
• be out of brain
• be out of depth
• be out of element
• be out of hands
• be out of head
• be out of league
• be out of line
• be out of luck
• be out of mind
• be out of mind with
• be out of mind with boredom
• be out of mind with [boredom/fear/worry etc.]
• be out of mind with fear
• be out of mind with worry
• be out of order
• be out of place
• be out of pocket
• be out of someone's hands
• be out of someone's league
• be out of someone's way