Animals — 2

as stubborn as a mule = very stubborn

There’s no point persuading him to join us: he’s as stubborn as a mule.

As Stubborn As A Mule

 

to flog a dead horse = to waste time trying to do something that will not succeed

We should admit our plan is a failure. All we are doing now is flogging a dead horse.

To Flog A Dead Horse

 

to have kittens = to get anxious

She has kittens whenever I mention her losing her job.

To Have Kittens 1

To Have Kittens 2

 

like water off a duck’s back = easily, without any apparent effect

Don’t waste your time telling him off. It’s like water off a duck’s back.

Like Water Off A Duck S Back

 

to let sleeping dogs lie = to not talk about things which have caused problems in the past, or to not try to change a situation because you might cause problems

We’d better not raise this question at the meeting. Let sleeping dogs lie.

To Let Sleeping Dogs Lie