关门打狗

1. • lit. shut the door and beat the dog (idiom)
2. • fig. seal off the enemy's avenue of retreat, then strike hard

Character by character

• 关(guān)surname Guan
• 门(mén)surname Men
• 打(dǎ)a semantically light, transitive verb that is combined with various grammatical objects to form compound verbs and verb-object phrases with a diverse range of meanings
• 狗(gǒu)dog