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 set fire to

:  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 arrive by chance :  happen

:  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

:  a covered passageway

:  a horizontal passageway through or under an obstruction

:  a subterranean gallery (as in a mine)

:  to make or use a tunnel

:  to pass through a potential barrier

:  to make a tunnel or similar opening through or under