The evidence of timely entrapment, and a warning to beware; see “spider”
It will depend on the state of the cobweb as to the spiritual interpretation.
A spider’s web can suggest the symbol of the eight pointed star, the mandala – an aid to meditation – and hence the buddhist eightfold path to spiritual enlightenment.
A dirty cobweb, however, denotes that spirituality is contaminated in some fashion.
Psychological / emotional perspective: The cobweb, because it is easily damaged, signifies indecision, perhaps an idea that has not quite crystallized yet.
Material aspects: On a purely practical level the cobweb symbolizes unused talents and potential which has been allowed to go stale.
A sign of laziness, unless there is also a spider present. See also Spider.
To brush one away means a triumph for you over an enemy.
If there is no spider in the web, it indicates calm days and happy times ahead.
If you see a web being spun, you’re in soon for some criticism.