觀釁伺隙

1. • lit. to look for holes, and observe gaps (idiom)
2. • fig. to search out one's opponent's weak points
3. • to look for the Achilles' heel

Character by character

• 觀(guān)look at
• 釁(xìn)quarrel
• 伺(sì)watch
• 隙(xì)crack