second arrow
Literal meaning: the second arrow in archery. Often used in the set phrase 二の矢が継げない (cannot follow up with a second arrow/action).
The first arrow missed, so I shot a second arrow.
second move; follow-up action
Figurative extension: a second attempt, move, or follow-up action, especially when the first one fails or is insufficient. Commonly used in negative potential forms like 二の矢が継げない.
彼の批判は鋭く、二の矢が継げなかった。
His criticism was so sharp that I couldn't follow up with a second point.
We don't have enough budget to make a second move.
His first proposal was rejected, so he's thinking of a second step.