Synecdoche is when a speaker uses a part of something to refer to the whole or uses the whole to refer to a part.
> <u>My soul</u> exalts the Lord. (Luke 1:46 ULB)
Mary was was very happy about what the Lord was doing, so she said "my soul," which means the inner, emotional part of herself, to refer to her whole self.
><u>the Pharisees</u> said to him, "Look, why are they doing something that is not lawful ...?" (Mark 2:24 ULB)
The Pharisees who were standing there did not all say the same words at the same time. Instead, it is more likely that one man representing the group said those words.
>I looked on all the deeds that <u>my hands</u> had accomplished (Ecclesiastes 2:11 ULB)
"My hands" is a synecdoche for the whole person, because clearly the arms and the rest of the body and the mind were also involved in the person's accomplishments.
### Translation Strategies
If the synecdoche would be natural and give the right meaning in your language, consider using it. If not, here is another option: