as fit as a flea

in very good health

非常健康

a flea in one's ear

a sharp reproof

尖銳的批評；嚴厲的非難

she expected to be sent away with a flea in her ear.

她猜自己會被狗血淋頭地罵走的。

a flea in (one's) ear

An annoying hint or a stinging rebuke.

諷刺：令人惱怒的暗示或尖刻的指責