noun
a helping hand; a little help; some assistance
Formal or literary term for a small amount of help or assistance. Often used in expressions like 一臂の力を貸す (to lend a hand).
彼は私に一臂の力を貸してくれた。
He lent me a helping hand.
このプロジェクトに一臂の力をお借りできませんか。
Could you give us a little help with this project?