swab

You might use this word when someone wipes a surface clean, especially in an older nautical setting where a sailor cleaned part of a ship. More often today, it refers to taking a small sample with a cotton or synthetic tip. A doctor may do this in your throat or nose to check for infection, and police or lab workers may do it on a surface to look for DNA. The idea is usually simple: wipe, clean, or take a sample from a small area.

The word has old roots connected with wiping or rubbing. Over time, it became common both for shipboard cleaning and for medicine. It can also name the tool itself: the small cotton-tipped stick used for cleaning or testing. In older informal use, it could even refer to a sailor, though that meaning is much less common now.

The word "swab" carries a few related meanings, and they all come back to the idea of wiping or rubbing a small area. In its older and more traditional sense, to swab something means to clean it by wiping it with water or another liquid, often with a cloth, mop, or similar tool. This use is strongly linked to ships: sailors swabbed the deck to keep it clean. In that setting, the word has a practical, workmanlike feel.

In modern everyday English, the word is often connected with medicine and testing. To swab a person or a surface means to rub it with a small cotton-tipped or synthetic-tipped tool in order to collect a sample. A doctor might swab your throat or nose to test for an infection. A nurse might swab a wound. In a lab or at a crime scene, someone might swab a table, a handle, or a patch of skin to collect material for testing, such as DNA. This meaning became especially familiar to many people during the COVID-19 period, when nasal testing was widely discussed.

The word can also be a noun. A swab is the tool used for this kind of cleaning or sample-taking: a small piece of absorbent material, often attached to a stick. In some contexts, especially older ones, it can also mean a mop-like cleaning tool used on a ship. There is also an old informal use where "swab" refers to a sailor. That meaning appears in historical or colorful language, but it is much less common today. Altogether, the word can describe an action, a tool, and, in older language, even a person, but the central idea stays the same: wiping, cleaning, or taking a sample from a small area.