De filer is a French verb which means "to slip away" or "to escape". Its antonyms would be words that mean the opposite of escaping or slipping away. Words such as "to capture", "to hold", "to detain", "to confine", or "to trap" would be the antonyms of "de filer". These words are often used in contexts where someone or something is trying to escape, such as in law enforcement or military situations. It is important to know the antonyms of a word like "de filer" to better understand its meaning and to improve one's vocabulary.