Use 'take back' when you want to apologize and show you regret saying something. I take back my earlier comments; I spoke out of turn.
Pro Tip 2/3
Strong Emotion
'Take back' implies strong emotions such as embarrassment or guilt related to what was said. I take back my words; they were hurtful and I'm deeply sorry.
Pro Tip 3/3
Public Correction
Saying 'take back' in public can show a willingness to correct oneself openly. In today's meeting, I need to take back my previous statement.