reinforcement
noun
uk/ˌriːɪnˈfɔːsmənt/ us [ C or U ]
the act of making an idea or belief stronger:
The new logo serves as a visual reinforcement of the company's values.
[ C, usually plural ]
extra people to help with work:
Shops had to call in reinforcements to help with the unexpected rush of customers.
[ C or U ] PRODUCTION
the act of making a material or structure stronger, or the thing that is added to a structure to make it stronger:
This wall needs some kind of reinforcement.
Titanium reinforcements were added to the structure.