To cloister someone or something is to shut the person or thing away from the world.

// The scientist cloistered himself in his laboratory all weekend to finish analyzing data.

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“Now, the past Melbourne High student body president and co-valedictorian is planning to step down Jan. 20 after serving nearly four years as NASA’s administrator. ... ‘My constitution is such that I’m not going to retire. And what I said is, I’m going to cloister myself and write a book. And then, we’ll see what happens,’ [Bill] Nelson, who is now 82, told reporters Wednesday during a roundtable discussion at the Kennedy Space Center Press Site.” — Rick Neale, Florida Today, 19 Dec. 2024

Cloister first entered the English language as a noun in the 13th century, referring then (as it still does) to a convent or monastery. More than three centuries later, English speakers began using the verb cloister to mean “to seclude in or as if in a cloister.” Today, the noun can also refer to the monastic life or to a covered and usually arched passage along or around a court. You may also encounter the adjective cloistered with the meaning “separated from the rest of the world [as if in a cloister],” as in “She leads a private, cloistered life in the country.” Cloister ultimately comes from the Latin verb claudere, meaning “to close.” Other words that can be traced back to the prolific claudere include close, conclude, exclude, include, preclude, seclude, and recluse.