掩耳盗铃yǎn ěr dào líng

把耳朵捂住去偷铃铛。比喻欺骗不了别人，只能欺骗自己。

例今若宿驿，正犹掩耳盗铃也。——明·赵弼《钟离叟妪传》

英plug one's ears while stealing a bell; deceive oneself as an ostrich that buries its head in the sand;