Ratchet/ˈrætʃɪt/ Definition 1 of 3Pro Tip 1/3One-way Mechanism Remember 'ratchet' as a device that locks movement one way, used in mechanical contexts. To tighten the pipes, you'll need a ratchet. Pro Tip 2/3Tool Varieties There are different types of ratchets, like wrenches or screwdrivers, suiting various tasks. I prefer using a ratchet wrench for these bolts. Pro Tip 3/3Action Sound Ratchets make a distinctive clicking sound as they turn, which can be useful in identifying the tool. You'll hear the ratchet click when it's secure.