1harm 
/ˈhɑɚm/ noun
/ˈhɑɚm/ noun [noncount] : physical or mental damage or injury : something that causes someone or something to be hurt, broken, made less valuable or successful, etc.
▪ No harm was done. ▪ I never meant to do/cause you any harm. [=I never meant to harm/hurt you in any way] ▪ They threatened him with bodily harm. ▪ The scandal has done irreparable/lasting/great harm to his reputation. ▪ I want to be sure that no harm will come to her. = I want to be sure that she won't come to any harm. [=that she won't be hurt in any way] ▪ She'll do anything to protect her children from harm. ▪ They have suffered serious physical/psychological harm. ▪ These new regulations could cause lasting harm to small businesses. ▪ He claims that he didn't mean any harm. [=that he didn't mean to hurt or bother anyone] ▪ What's the harm in letting her leave early? = I don't see any harm in letting her leave early. = There's no harm in letting her leave early. [=letting her leave early will not hurt anyone or cause a bad result] ▪ He thinks the treatment may do more harm than good. [=be more harmful than helpful]
▪ No harm was done. ▪ I never meant to do/cause you any harm. [=I never meant to harm/hurt you in any way] ▪ They threatened him with bodily harm. ▪ The scandal has done irreparable/lasting/great harm to his reputation. ▪ I want to be sure that no harm will come to her. = I want to be sure that she won't come to any harm. [=that she won't be hurt in any way] ▪ She'll do anything to protect her children from harm. ▪ They have suffered serious physical/psychological harm. ▪ These new regulations could cause lasting harm to small businesses. ▪ He claims that he didn't mean any harm. [=that he didn't mean to hurt or bother anyone] ▪ What's the harm in letting her leave early? = I don't see any harm in letting her leave early. = There's no harm in letting her leave early. [=letting her leave early will not hurt anyone or cause a bad result] ▪ He thinks the treatment may do more harm than good. [=be more harmful than helpful]
harm's way
: a dangerous place or situation
▪ As a war correspondent, she never hesitated to put herself in harm's way. ▪ The soldiers were sent into harm's way. ▪ The tug towed the sailboat out of harm's way.
▪ As a war correspondent, she never hesitated to put herself in harm's way. ▪ The soldiers were sent into harm's way. ▪ The tug towed the sailboat out of harm's way.
no harm done
informal — used to tell someone that no apology or concern is necessary because no damage has been done ▪ “I'm so sorry about forgetting to call earlier.” “That's OK. No harm done.”
