<p><strong>Verb</strong></p><ul><li>To allow or permit: If we let him escape, he'll lead us to the boss.</li><li>To allow to pass, go, or come: The gap is too narrow to let the car through.</li><li>To grant the occupancy or use of (land, buildings, rooms, space, etc., or movable property) for rent or hire: The family lets out their spare room in the summer for extra money.</li><li>To contract or assign for performance, usually under a contract: They let work to a local carpenter for the repairs.</li><li>To cause to; make: You must let her know the truth of your circumstances if you want to marry her.</li><li>(Used in the imperative as an auxiliary expressive of a request, command, warning, suggestion, etc.): Let me see. Let us go. Just let them try it!</li></ul><p><strong>Noun</strong></p><ul><li>British. A lease.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>To slacken; diminish; abate: This heat wave should let up by the end of the week.</li><li>To cease; stop: The rain let up for a few hours.</li><li>To divulge; make known.</li><li>To release from confinement, restraint, etc.</li><li>To enlarge (a garment).</li><li>To terminate; be finished; end: When does the university let out for the summer?</li><li>To treat less severely; be more lenient with: He refused to let up on the boy until his grades improved.</li><li>To admit.</li><li>To involve (a person) in something without their knowledge or permission: to let someone in for a loss.</li><li>To insert into the surface of (a wall or the like) as a permanent addition: to let a plaque into a wall.</li><li>To share a secret with; permit to participate in.</li><li>To reveal one's true feelings: She was terrified at the prospect, but didn't let on.</li><li>To pretend: They let on that they didn't care about not being invited, but I could tell that they were hurt.</li><li>To release by exploding.</li><li>To free from duty or responsibility; excuse.</li><li>To allow to go with little or no punishment; pardon: The judge let off the youthful offender with a reprimand.</li><li>To disappoint; fail.</li><li>To betray; desert.</li><li>To slacken; abate: We were too near success to let down in our efforts.</li><li>To allow to descend slowly; lower.</li><li>(Of an airplane) To descend from a higher to a lower altitude preparatory to making an approach and landing or a similar maneuver.</li></ul>