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English to English noun
| 1 |
something or someone that causes anxiety; a source of unhappiness |  | Example: New York traffic is a constant concern
it's a major worry
source: wordnet30
| 2 |
pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs | | source: wordnet30
| 3 |
Pain in the head; cephalalgia. | | source: webster1913
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