verb -dat⋅ed, -dat⋅ing.| 1. | to cause or allow (a building, automobile, etc.) to fall into a state of disrepair, as by misuse or neglect (often used passively): The house had been dilapidated by neglect. |
| 2. | Archaic. to squander; waste. |
| 3. | to fall into ruin or decay. |