a light at the end of the tunnel

: 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

: the part of an area that lies at the boundary

: a point that marks the extent of something

: the point where something ceases to exist

: to bring to an end

: destroy

: to make up the end of

: final, ultimate

: to put (grain or hay) into a barn or stack

: within : inside — compare ect-, exo-

: taking in

: a covered passageway

: a subterranean gallery (as in a mine)

: burrow

: to make or use a tunnel

: to pass through a potential barrier

: to make a tunnel or similar opening through or under