1. filch - Noun
2. filch - Verb
To steal or take privily (commonly, that which is of little value); to pilfer.
Source: Webster's dictionaryFilch was said to find cleaning supplies here when he had run out; when Fred and George Weasley needed a place to hide, it would appear as a broom cupboard. Source: Internet
Filch knows of just four of these while the Marauders (Remus Lupin, Peter Pettrigrew, Sirius Black and James Potter) and the Weasley twins know of all seven, though where some lead is unknown. Source: Internet