A heart of oak noun phrase
Said of a strong and courageous nature
Many practitioners with hearts of oak have volunteered to support the national health system in the fight against COVID-19.
Bartok must have a heart of oak when he jumped into the floodwaters to save the lives of three children.
Used to say that someone is very courageous.
1. (literal) To make something stronger by supporting it
2. (figurative) To mentally or physically prepare yourself or someone else for something unpleasant that is going to happen
To behave in a way showing that you are confident and proud of yourself.
To have the bravery to do something risky, difficult, or unpleasant.
If someone has nerves of steel, they have the ability to control fear and stay calm in stressful situations.
The literal meaning of the phrase "a heart of oak" is the heartwood of the oak. The heartwood is the dense, inner part of the wood of a tree trunk, yielding the hardest timber. The figurative usage is first recorded in The first part of the true and honorable history, of the life of Sir John Old-castle, the good Lord Cobham (1600), by the English playwright and translator Anthony Munday (died 1633).