想當然耳 - Zhictionary

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想當然耳

想当然耳

xiǎngdāngráněr

variant of 想當然爾 xiǎngdāngráněr

耳，語末助詞，無義。想當然耳表示雖然未必真的有這種事，但是推測它必然如此。

重編國語辭典

Entry Composition

xiǎngdāngrán

to take sth as given; to make assumptions

ear
handle (archaeology)
and that is all (Classical Chinese)