moonlight /ˈmuːnlaɪt/verb 6noun 7forms 3phrases 2 verb6 •Of a thing: to perform a secondary function substantially different from a supposed primary function.Some proteins have a primary function of acting as enzymes, but moonlight by carrying out secondary roles such as signal transduction or transcriptional regulation. •(informal) to do a second job for money in the evening or at night, as well as a main oneThere are three individual rear seats. They all slide, they all fold, or they can all be removed completely, so that you can moonlight as a van. — 2004 •(informal) To engage in an activity other than what one is known for. •(informal) To do a moonlight flit: to secretly leave premises without paying the rent, supposedly at night by the light of the Moon. •(Ireland, historical) To make a night-time attack on a tenant farmer not supporting the policies of the Irish National Land League. •(Ireland, historical) Of a tenant farmer: to be attacked for not supporting the policies of the Irish National Land League. noun7 •[before a noun] The light reflected from the Moon, which seems to emanate from it.Than Ripheus him self adioynd, & myghty most with launce / Came Iphitus onto my side, by monelight met by chaunce. — 1555 •(informal) Chiefly in to do a moonlight: short for moonlight flit (“an act of secretly leaving premises without paying the rent, supposedly at night by the light of the Moon; hence, any act of escaping at night”). •(no longer used) The silvery colour of the light reflected by the Moon. •(dialect, no longer used) Synonym of moonshine (“illegally produced or smuggled spirits”).Barter'd for game from chace or warren won, / Yon cask holds moonlight, run when moon was none; / And late-snatch'd spoils lie stow'd in hutch apart, / To wait the associate higgler's evening cart. — 1809 •(no longer used) A picture of a scene illuminated by light reflected by the Moon. •(no longer used, rare) A journey made at night when the Moon is shining. •(US, no longer used) An oratorical competition; also, a participant in such a competition. formsmoonlighted · moonlighting · moonlights Phrases with moonlight moonlight and rosesA very pleasant, sentimental, or romantic situation or atmosphere. moonlight flitAn act of secretly leaving premises without paying the rent, supposedly at night by the light of the Moon; hence, any act of escaping at night.