A letter sign-off is the way a person ends a letter, usually with a polite phrase. The most common crossword solutions for the term letter sign-off are BEST (4 letters), LOVE (4 letters), YOURS (5 letters), FONDLY (6 letters), ASEVER (6 letters), and REGARDS (7 letters). BEST is an abbreviation of 'BEST wishes, ' LOVE is a term of endearment, YOURS is a possessive pronoun, FONDLY is an adverb meaning with affection, ASEVER is an archaic term meaning always, and REGARDS is a polite expression of good wishes.