السكك الحديدية الخفيفة : المترو الخفيف : light sleeper n noun: Refers to person, place, thing, quality, etc. ([sb] who does not sleep deeply) مَن نومه خفيف : light switch n noun: Refers to person, place, thing, quality, etc. (lever or knob for controlling a light) مفتاح الإضاءة