From Longman Dictionary of Contemporary Englishwarm the cockles of somebody’s heartwarm the cockles of somebody’s heartespecially British EnglishHAPPY to make someone feel happy and full of good feelings towards other people Seeing her new baby just warms the cockles of your heart. → cockle
Examples from the Corpus
warm the cockles of somebody’s heart• It warms the cockles of my female heart to know that such womanly wiles still continue to manipulate and convince. 