a helping hand
Assistance with a task, or a person who provides such assistance. I could really use a helping hand carrying all of these boxes downstairs. You've been such a helping hand with this dinner, I couldn't have done it without you!
*a helping hand
Fig. help; physical help, especially with the hands. (*Typically: get ~; need ~; give someone ~; offer ~; offer someone ~.) When you feel like you need a helping hand making dinner, just let me know.