[ míng qiāng hǎo duǒ，àn jiàn nán fáng ]

指公开攻击容易对付，暗地陷害劫难于防备。亦作“明枪易躲，暗箭难防”。

lit. easy to dodge the spear in the open, hard to avoid a stab in the dark (idiom); it is hard to guard against secret conspiracies