Define: "There's no use crying over spilt milk".

Don't complain about something that can't be fixed

Henry says to Adam, "Don't give up on your day job.."
What is he implying?

"Break a leg!" Violet's mum yelled from afar.

What does she mean by this?

Sit back on a chair and break one of the legs.

What does it mean to be "barking up the wrong tree"? 

I know this might be "a hard pill to swallow". 

What does this mean?

Their tablets are too big, they can't swallow them. 

Trying to achieve something that is too difficult.

We finally "see eye to eye" on this.

What does this mean?