The idiom 'walking on eggshells' means being very cautious in dealing with someone or some situation to avoid offending or upsetting them. It implies a state of being overly careful in one's words or actions due to fear of provoking a negative reaction. The literal interpretations like 'walking with great care' or 'undertaking an uncomfortable journey' miss the idiomatic meaning related to interpersonal sensitivity. Hence, 'Careful not to offend or upset others' is correct.
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