1. engaging in philosophical discussion or reflection; thinking deeply about fundamental questions or ideas
Usage: British spelling; American English typically uses 'philosophizing'; present participle or gerund form of 'philosophise'
2. talking or writing about philosophy in a way that is abstract, impractical, or overly theoretical
Usage: often used with a slightly critical or dismissive tone

Examples

• She spent the afternoon philosophising about the nature of happiness.
• The students were philosophising about free will and determinism in their ethics class.
• Instead of philosophising about climate change, we need to take concrete action.
• He enjoys philosophising with his friends over coffee about life's big questions.
• The professor was philosophising about truth and reality during the lecture.
• They were philosophising endlessly without reaching any practical conclusions.