What does thumb mean?
Thumb is the short, stout digit on the inner side of the hand, opposite the little finger. Because it can oppose the other fingers, it gives the hand a powerful and precise grip and is useful for gripping, pointing, pressing, and handling small objects. The word also has important figurative and informal uses. Raising the thumb, or giving a “thumbs-up,” commonly signals approval, praise, or encouragement. As a verb, “thumb” can refer to making that gesture, as in “the reviewer thumbed up the film.” In another familiar expression, “thumb a ride” means to hitchhike. Thumb can also describe turning through pages, as in “I thumbed through the magazine while waiting.” Together, these meanings connect the word’s physical body part with human gestures, judgments, movement, and everyday browsing. Its unusual combination of anatomical precision and informal social symbolism makes thumb especially useful for describing both what the hand does and what people communicate without saying a word.
The short, stout digit on the inner side of the hand, opposite the little finger; also, by extension, a raised thumb used to indicate approval or encouragement.
"The climber checked the rope with his thumb before continuing."
The anatomical sense is neutral and standard. The gesture sense is especially common in the expressions “thumbs-up” and “thumbs-down.”
To signal approval with the thumb, to hitchhike, or to turn through the pages of a book or other publication.
"They thumbed through a few magazines while waiting for the train."
“Thumb a ride” is informal and especially associated with hitchhiking; “thumb through” is common for casually turning pages.
The standard plural of the noun is thumbs, as in “both thumbs” or “the thumbs of the hand.”
"The spectators raised their thumbs in approval."
Raise a thumb and the meaning travels faster than words: a thumbs-up can turn a whole room into a verdict.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does thumb come from?
The English word comes from Old English þūma, the native Germanic word for the thumb. It developed through Middle English forms with initial th- into modern English thumb. Cognates survive in other Germanic languages, including German Daumen, Dutch duim, Old Norse þúma, and Old Saxon thūma.
Related word forms
How thumb is actually used
The anatomical noun is standard in British and American English. As a verb, “thumb a ride” is informal, while “thumbs-up” is widely understood as a sign of approval, sometimes with a less enthusiastic or more ironic tone.