What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
with object To signify or indicate in addition, especially through the use of grammar (as by declension, case, tense, etc.). Compare earlier adsignification.
Late 17th century. From classical Latin adsignificāre (also assignificāre) to make evident, show, prove, (of words) to denote, mean from ad- + significāre.