noun
target of opportunity
A military or strategic term for a target that presents itself unexpectedly and is engaged without prior planning. Not used in everyday conversation.
偵察中に臨機目標を発見し、即座に攻撃を開始した。
During reconnaissance, they spotted a target of opportunity and immediately commenced the attack.
Compound of 臨機 (adapt to the situation) and 目標 (target). The exact historical derivation is uncertain; the term is primarily used in military contexts.