Chunks, also known as lexical bundles or formulaic sequences, are combinations of words that are frequently used together. Common types include:

A "patched" PDF usually implies a document that has undergone a revision process to improve its accuracy or usability. For English learners, a patched list is superior because: Chunk-Spotting: A User's Guide | Cambridge English

Words that just "fit" naturally, like heavy rain (not strong rain ) or make a mistake (not do a mistake ).

Learning in means memorizing groups of words that naturally go together, rather than learning individual words and trying to assemble them with complex grammar rules. This method is a proven shortcut to sounding more like a native speaker. What Are English "Chunks"?