馬脚を現す
Idiom- 1to reveal one's true nature ; to show one's true colours ; to give oneself away ; to be exposed (of a lie, etc.) Translated by Jiyomi
Other writings and readings
馬脚を表す馬脚を露わす馬脚をあらわす馬脚を露す馬脚を表わす馬脚を現わす
expressions (phrases, clauses, etc.) · Godan verb with 'su' ending
JMdict entry 1928870. Source and licence.