节外生枝的英文：
[Literal Meaning]
node/outside/grow/branch
to grow new branches on a node

[解释]
本不应该生枝的地方生枝。比喻在原有问题之外又出了新问题。

[Explanation]
New problems crop up unexpectedly; to complicate an issue deliberately; to create side issues

[例子]
前一段很顺利，没想到这个时候节外生枝。

[Example]
Things went quite smoothly during the recent days, but now new problems cropped up unexpectedly.