To not violate even the slightest bit; to be scrupulously disciplined and not harm or disturb others or their property.
这支施工队伍纪律严明，在居民区作业期间，做到了纤毫无犯，得到了大家的一致好评。
This construction team maintained strict discipline; during their operations in the residential area, they ensured not to disturb or harm anyone in the slightest, earning unanimous praise from everyone.
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