pink slip

give someone the slip

To evade, escape, or get away from somebody.

let slip

To divulge a secret, as by accident or mistake.

let something slip

To accidentally reveal a secret.

slip back to old ways

to return to past bad habits

slip into

To put on some clothes rapidly.

slip of the pen

A mistake in handwriting; (loosely) any minor error by the writer that made it into print, having not been caught by editors or proofreaders.

slip of the tongue

A mistake in speech.

slip out

To leave quietly and unnoticed.