Both "our heart" and "our hearts" can be correct, depending on the context in which they are used.
"Our heart": This is the singular form, and it refers to the collective heart of a group of people or an entity. It's used when speaking about a shared emotion, feeling, or sentiment that unites a group. For example:
- "As a team, our heart is set on winning the championship."
- "In times of crisis, our heart goes out to those affected."
"Our hearts": This is the plural form, and it refers to the individual hearts of the members within a group. It's used when talking about the emotions or feelings of each person within the collective. For example:
- "When we saw the injured animals, our hearts were filled with compassion."
- "As a family, our hearts are connected, and we support each other through thick and thin."
So, the choice between "our heart" and "our hearts" depends on whether you are talking about the shared emotion or feeling of the group as a whole (singular) or the emotions or feelings of the individuals within the group (plural).