The term 'let know' can be expressed in a variety of ways. The most common crossword solutions for this term are 'INFORM' (6 letters), 'ALERTED' (7 letters), 'NOTIFY' (6 letters), 'TOLD' (4 letters), and 'cluein' (6 letters). To 'INFORM' someone is to give them knowledge or facts about something. To be 'ALERTED' is to be warned or made aware of something. To be 'NOTIFIED' is to be informed of something, usually through an official announcement. To be 'TOLD' is to be given information by someone else. To be 'cluein' is to be made aware of something, usually through subtle hints or clues.