Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.
a tower of strength
a person who provides strong and reliable support
The man has been a tower of strength to his sister since her husband died.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a group of words, or in other words, a phrase that has a meaning different from the literal meaning of the words in it.