concern

1 concern /kənˈsɚn/ noun
plural concerns
1 concern
/kənˈsɚn/
noun
plural concerns
Britannica Dictionary definition of CONCERN
1 
a  : a feeling of worry usually shared by many people
[noncount]
[count]
b  [count] : something that causes people to worry
2 
: a feeling of being interested in and caring about a person or thing
[noncount]
[singular]
3 
[count] : something that is regarded as important
4 
[count] : something that a person is responsible for or involved in — usually singular
5 
[count] formal : a business or company
2 concern /kənˈsɚn/ verb
concerns; concerned; concerning
2 concern
/kənˈsɚn/
verb
concerns; concerned; concerning
Britannica Dictionary definition of CONCERN
[+ object]
1 
: to relate to (something or someone) : to be about (something or someone)
2 
: to affect or involve (someone) : to be the business or interest of (someone)
◊ The phrase To whom it may concern is used at the beginning of a formal letter (such as a letter written to a company) when the name of the person who will read the letter is not known.
3 
: to make (someone) worried : to cause concern for (someone)

concern yourself

: to become involved or interested in something : to give your attention to something