To go off half-cocked

To be discharged prematurely, or with the trigger at half cock; - said of a firearm.
To do or say something without due thought or care.

See also: Halfcock, Halfcock

References in periodicals archive ?
One reason that silent people become so quiet is they themselves are sensitive to the power in words and don't prefer to go off half-cocked. Words can be scorching, sharp as knives, explosive as bombs.
But just because UMass is the city's biggest employer and its research scientists sport enormous brains, we can't allow it to go off half-cocked whenever it feels like it.