relate to; be about

the story concerns a friend of mine

the report is mainly concerned with 1984 onwards

make (someone) anxious or worried

the roof of the barn concerns me because eventually it will fall in

don't concern yourself, old boy—my lips are sealed

anxiety; worry

Carole gazed at her with concern

a matter of interest or importance to someone

housing is the concern of the Housing Executive

the prospect should be of concern to us all

a business

the town's only travel agent was a small, debt-ridden concern

a complicated or awkward object