To contradict oneself; to make a self-contradictory statement; to be inconsistent.
他的计划真是鬻矛誉楯，一方面说要节约开支，另一方面又提议购买昂贵的设备。
His plan is truly self-contradictory; on one hand, he talks about saving expenses, and on the other hand, he proposes buying expensive equipment.
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