From Longman Dictionary of Contemporary Englishtower of strengthtower of strengthHELPsomeone who gives you a lot of help, sympathy, and support when you are in trouble Her father was a tower of strength to her when her marriage broke up. → tower
Examples from the Corpus
tower of strength• You're always a tower of strength.• My mother has been a tower of strength.• Tactful, encouraging, a tower of strength to lean on.• John seems a tower of strength and reason.• She was a tower of strength, giving me lessons on a weekly basis. 