台Taivo A Taiwan Mandarin dictionary

牝牡驪黃

pìnmǔlíhuáng

ㄆㄧㄣˋ ㄇㄨˇ ㄌㄧˊ ㄏㄨㄤˊ

Simplified 牝牡骊黄

1a black stallion or possibly a yellow mare (idiom); don't judge by outward appearance

Keep 牝牡驪黃 and it comes back until you know it.