| 1. | ready to fire a gun at the least provocation, regardless of the situation or probable consequences: a trigger-happy hunter. |
| 2. | heedless and foolhardy in matters of great importance and recklessly advocating action that can result in war: Some called him a trigger-happy candidate. |
| 3. | eager to point out the mistakes or shortcomings of others; aggressively or wantonly critical: He's a trigger-happy editor with a nervous blue pencil. |

trigger-happy
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trigger happy
Inclined to act violently at the slightest provocation, as in They feared that the President was trigger happy and would send in troops at the drop of a hat. This expression alludes to being too eager to fire a gun. [c. 1940]