The biblical meaning of a coffin in a dream symbolizes death or the spirit of death. The enemy is raising a curse of death on your habitation or place of work. This may not necessarily kill you; however, this spell will cause the death of your progress.

If it’s a business you are running, definitely it will collapse and you will go bankrupt. This is an evil dream and you must dedicate it to God for destruction as well as dedicate your enemies.
Example of a man delivered from dreaming of a coffin.
During a deliverance session at Jesus Teaching Ministries, demons confessed how they had bound a certain man through the same means. This man had a dream in which he saw a coffin in Infront of his shop.
The enemies took a dead body and washed it with water and then mixed the water with some blood then poured it in front of his shop. This ritual raised an evil covenant against his progress and bound his shop. They wanted him to go bankrupt and close it.
Related: Sex dream interpretation.
These people were jealous of his achievements because he had a gift to do business. They wanted to steal that gift too. This is how far your enemies can go to see you suffering. Should you just sit down and watch them rob you? No. Then dedicate them for destruction and also dedicate your business for protection.
If you still don’t believe this is possible, please consider reading Ezekiel 13:18-22, and see it yourself.