Jisho

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きゃくあらわ 馬脚
Expressions (phrases, clauses, etc.), Godan verb with 'su' ending
1. to reveal one's true nature; to show one's true colours; to give oneself away; to be exposed (of a lie, etc.)Idiomatic expression
Other forms
馬脚をあらわす 【ばきゃくをあらわす】馬脚を露わす 【ばきゃくをあらわす】馬脚を露す 【ばきゃくをあらわす】

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