疙瘩 | gē da | swelling or lump on skin / pimple / knot / preoccupation / problem | |
心结 | xīn jié | a matter that gnaws at one's mind / preoccupation / sore point / rancor | |
如临大敌 | rú lín dà dí | lit. as if meeting a great enemy (idiom) / fig. cautious / with great preoccupation / with strict precaution |