tower of strengthsomeone who gives a lot of support to someone else who is in a difficult situation
[TahlilGaran] Dictionary of Contemporary English ▲
tower of strength n. phr. Someone who is strong, helpful, and sympathetic, and can always be relied on in times of trouble.
John was a veritable tower of strength to our family while my father was in the war and my mother lay ill in the hospital. [TahlilGaran] English Idioms Dictionary ▲