| a gadget; dingus; thingumbob. |
| a chattering or flighty, light-headed person. |
on trial
In the process of being tried, especially in a court of law. For example, He would be put on trial for the murder of his wife. [Early 1700s]
As a test of something, on probation, as in They said we could take the vacuum cleaner on trial and return it if it was too noisy. [Early 1700s]