临阵磨枪

1. • to sharpen one's spear only before going into battle (idiom)

     lit.

2. • to make preparations only at the last moment

     fig.

Character by character

• 临(lín)face
• 阵(zhèn)disposition of troops
• 磨(mó)rub
• 枪(qiāng)surname Qiang