A pledge is a solemn promise or agreement to do something. A CLEANER is someone who cleans and maintains buildings, equipment, and other areas. The seven-letter crossword solution for the term pledge, e.g. is VOWELS, which refers to the vowels in the English language that are used to make up words and phrases. Vowels are often used to make up pledges, such as marriage vows or promises to uphold a certain code of conduct.