plural of light rail

(US, Canada, rail transport) A kind of passenger railway in urban and suburban settings typically characterized by a mixture of tram (or in North America streetcar) and metro features, crossing streets at grade crossings and normally powered by electricity.

(idiomatic) An acclaimed expert, one of the foremost experts, a luminary. / (nautical, navigation) A light that helps to guide vessels into a port.

plural of leading light

(idiomatic, religious) To undergo a spiritual conversion. / (idiomatic) To gain an understanding of something previously not understood, especially in a sudden insight.

(astronomy) A phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance, analogous to an echo of sound.

(transitive) To illuminate, to bring light to something, to brighten. / (intransitive) To show an increase in activity or a brightening of mood. / (intransitive) To light a cigarette, pipe, etc.

(transitive, nautical) To loosen, slacken, or ease off.

(intransitive, slang, dated) To go away or depart, especially in haste or without notice.

In a light-minded manner; frivolously or without serious consideration.