Hemingway’s phrase defines courage not simply as fearlessness, but as the ability to retain composure when circumstances become difficult or dangerous. “Grace” suggests steadiness, dignity and control, while “pressure” refers to the conditions that test those qualities. Courage, in this formulation, is therefore revealed through behaviour when a person is exposed to fear, uncertainty or hardship.

The definition also places emphasis on how adversity is faced rather than on whether it can be avoided or overcome. Someone may feel fear or suffer setbacks and still act with discipline and self-possession. This distinguishes courage from bravado, which may depend more on appearance or confidence. The phrase has consequently become applicable well beyond physical danger, including leadership, professional responsibility and personal crises. Its central idea is that character becomes most visible under strain, when maintaining judgement, restraint and dignity is more difficult than under ordinary conditions.