verb, seized, seiz⋅ing.| 1. | to take hold of suddenly or forcibly; grasp: to seize a weapon. |
| 2. | to grasp mentally; understand clearly and completely: to seize an idea. |
| 3. | to take possession of by force or at will: to seize enemy ships. |
| 4. | to take possession or control of as if by suddenly laying hold: Panic seized the crowd. |
| 5. | to take possession of by legal authority; confiscate: to seize smuggled goods. |
| 6. | Also, seise. Law. to put (someone) in seizin or legal possession of property (usually used in passive constructions): She was seized of vast estates. |
| 7. | to capture; take into custody. |
| 8. | to take advantage of promptly: to seize an opportunity. |
| 9. | Nautical. to bind or fasten together with a seizing. |
| 10. | to grab or take hold suddenly or forcibly (usually fol. by on or upon): to seize on a rope. |
| 11. | to resort to a method, plan, etc., in desperation (usually fol. by on or upon): He must seize on a solution, however risky. |
| 12. | to have moving parts bind and stop moving as a result of excessive pressure, temperature, or friction (usually fol. by up): The engine seized up from cold. |

seize up
Come to a halt, as in The peace talks seized up and were not rescheduled. Originally, from about 1870 on, this term was applied to a machine of some kind that jammed or locked, owing to excessive heat or friction. Its figurative use dates from about 1950.