1 refer or relate to, have relation or reference to, be about, pertain or appertain to, be pertinent or relevant to, regard, apply to, be connected or involved with, bear on, be germane to, be connected with, involve, apply to, touch (on):
The matter concerns your inheritance, Cosgrove.
2 affect, have (a) bearing or (an) influence on, involve, touch; interest, be of importance or interest to:
This war concerns us all.
3 worry, trouble, disturb, bother, perturb, unsettle, upset, distress:
He doesn't let anything concern him.
4 business, affair, problem; responsibility, duty, charge, task, involvement, Colloq thing; Slang bag, shtick:
What she does is no concern of yours. The safety of the passengers is his concern.
5 interest, regard, consideration, care, thought, awareness, attention:
You should show more concern for those less fortunate than you.
6 anxiety, worry, solicitude, apprehension, distress, apprehensiveness, uneasiness, malaise, disquiet, disquietude:
It's only a cold, and no cause for concern.
7 business, firm, company, house, establishment, enterprise, organization:
The business is being sold as a going concern.
8 matter, affair, issue:
The preservation of wildlife is an international concern.