Definition of come or play the old soldier in English:

come (or play) the old soldier

informal Use one’s greater age or experience of life to deceive someone or to shirk a duty: if the crew had played the old soldier, there’s no way we could have got by
See parent entry: old soldier

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Word of the day demoralize
Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit