Mankinds only defense against the evil monsters of the night. If you don't have one, your days are numbered.
Nightlight, could we survive without you?
by MaximumOverdrive October 18, 2008
A tool commonly used by children under the age of 8 to scare the piss out of the boogeyman as he creeps out of the closet. Causes burning of the scalp, eyes, and genitals.
John's nightlight really helped him get to sleep.
by Kyleddeck July 30, 2008
kids use this to keep away nightmares. this variant of the word shows how even in the roughest times, the light outshines the darkest night
i still use a nightLight when i sleep.

same. i can't sleep without one
by OriginalHomie May 20, 2019
A small dim light that is left on all night when people need to find their way to the bathroom.
They turned on their nightlight.
by David March 7, 2004
A stub signal left behind in an old format for users who have yet to convert to the new format. The term comes from the SAFER Act, a US law allowing analog TV stations to keep broadcasting information on digital conversion (and, in some cases, local news and emergency information) after the station has otherwise gone all-digital.
I tried running some old Mac software on an old Mac, but forgot the software I was using was PowerPC-only. Good thing the nightlight box popped up; now I have to go find my PowerBook G3.
by February 19, 2009