Dear teachers,

Would you be kind enough to tell me whether I am right with my interpretation of the expressions in bold in the following sentences?

Im sure that she had a heart of gold.

a heart of gold = soft-hearted, very kind and good, easily moved by suffering

To grow old with a heart of stone no, not even sstone, with a heart of tin, a heart of plastic sould one imagine a worse punishment?

a heart of stone = an antonym of a heart of gold = a very cold and unfeeling nature

I am afraid there is no taking it back now that everythink has been decided.

to take something back = to withdraw

He looked again at the prepossessing shelved of books to be read and understood, and he wondered at his temerity in thinking that this was going to be taken in his stride.

to take something in ones stride = to do something without effort

We show temerity in hasty decisions, and the conduct to which they lead.

temerity = fearless daring

We show rashness in particular actions, as dictated by sudden impulse.

rashness = the trait of giving little thought to danger

It is an exhibition of temerity to approach the verge of a precipice; it is an act of rashness to jump into a river without being able to swim. Temerity, then, is an unreasonable contempt of danger; rashness is a rushing into danger from thoughtlessness or excited feeling.

It is notorious temerity to pass sentence upon grounds uncapable of evidence.

He had the temerity to file a grievance.

The temerity of her behaviour shocked him.

He had the temerity to propose to the richest girl in the town.

He had the temerity of reading a secret letter.

Advantage is a better soldier than rashness.

Thank you for your efforts.