Definition of "heart-breaking" []

• That causes extreme sorrow or grief. (adjective)

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• "And of all heart-breaking labors, that of breaking trail is the worst."
• "At times, when he deemed he had drawn clear, his head dizzy with the painful pounding of his heart and the suffocating intake of his breath, he slackened down; and ever the shadow leaped out of the gloom and forced him on in heart-breaking flight."
• "Another day of heart-breaking and dangerous toil saw us in camp with the two topmasts to the good."