Grant permission is a phrase that is used to give someone the authority to do something. It can be used in a variety of contexts, such as allowing someone to enter a building or giving someone permission to use a certain resource. The three crossword solutions for this term are LET (3 letters), ALLOW (5 letters), and SAYYES (6 letters). LET is an informal way of saying 'ALLOW' or 'PERMIT, ' while ALLOW is a more formal way of expressing the same concept. SAYYES is an affirmative response to a request for permission. All three words indicate that someone has been given the authority to do something.