
Filch
Colloquial Usage
 Filch is usually used in casual or informal speech rather than in formal writing. 
Lisa filched some fries off my plate when I wasn't looking.
 Petty Theft
 Use 'filch' for small, often insignificant acts of theft, not for grand or serious thefts. 
I caught my brother trying to filch a few dollars from my wallet.
 Slight Negative Connotation
 While 'filch' implies wrongdoing, it's often perceived as less serious or malicious than stronger theft terms. 
I wouldn't trust him; he has a habit of filching office supplies.