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• n  a message that departs from the main subject
• n  a turning aside (of your course or attention or concern)

• After 162 years of debate and divagation, fears and false starts, France and Britain last week decided to connect island and mainland with a crossChannel tunnel.
• There is divagation, fumbling with incidents and words.

• digression
• aside
• excursus
• parenthesis
• diversion
• deviation
• deflection
• deflexion