night lettern. Abbr. NLTA telegram sent at night at a reduced rate for delivery the next morning.
[TahlilGaran] American Dictionary ▲
night letter n. A telegram sent at night at a cheaper rate and delivered in the morning.
I waited until after six o'clock in the evening before sending the telegram home because I can say more for the same price in a night letter. [TahlilGaran] English Idioms Dictionary ▲