Whack-a-mole definitions

(idiomatic) The practice of trying to stop something that persistently occurs in an apparently random manner at the point where the occurrence is noticed, such as terminating spammers’ e-mail accounts or closing pop-up advertisement windows.

It’s like whack-a-mole: as soon as you fix one, another appears.

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Origin of whack-a-mole

From the arcade game Whac-A-Mole, which involves quickly and repeatedly hitting the heads of mechanical moles with a mallet as they pop up from holes.