watchdog
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1watch·dog

noun \-ˌdg\

Definition of WATCHDOG

1
: a dog kept to guard property
2
: one that guards against loss, waste, theft, or undesirable practices

First Known Use of WATCHDOG

1612

2watchdog

transitive verb

Definition of WATCHDOG

: to act as a watchdog for

First Known Use of WATCHDOG

1902

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