anything that accompanies X and is regarded as an indication of X's existence | the sudden occurrence of a violent discharge of steam and volcanic material |
(medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease | a sudden very loud noise |
| the emergence of a tooth as it breaks through the gum |
| a sudden violent spontaneous occurrence (usually of some undesirable condition) |
| (of volcanoes) pouring out fumes or lava (or a deposit so formed) |
| symptom consisting of a breaking out and becoming visible |