a light bulb goes off/on (in someone's head)

: something that makes vision possible

: the sensation aroused by stimulation of the visual receptors

: electromagnetic radiation of any wavelength that travels in a vacuum with a speed of 299,792,458 meters (about 186,000 miles) per second

: having light : bright

: not dark, intense, or swarthy in color or coloring : pale

: medium in saturation and high in lightness

: to become light : brighten

: to take fire

: to ignite something (such as a cigarette)

: having little weight : not heavy

: designed to carry a comparatively small load

: having relatively little weight in proportion to bulk

: lightly

: with little baggage

: dismount

: settle, alight

: to fall unexpectedly

: a resting stage of a plant (such as the lily, onion, hyacinth, or tulip) that is usually formed underground and consists of a short stem base bearing one or more buds enclosed in overlapping membranous or fleshy leaves

: a fleshy structure (such as a tuber or corm) resembling a bulb in appearance

: a plant having or developing from a bulb

: present tense third-person singular of go

: plural of go

: from a place or position

: at a distance in space or time

: from a course : aside

used as a function word to indicate physical separation or distance from a position of rest, attachment, or union

: to seaward of

: from the possession or charge of

: seaward

: right

: more removed or distant

: to go away : depart

: kill, murder

: competition : contest

: some person : somebody