Dutch word ontsnappen comes from Dutch ont-, Dutch snappen (To catch in the act. To get, to understand.)

Detailed word origin of ontsnappen

Dictionary entry	Language	Definition
ont-	Dutch (nld)	Forms inchoative verbs, indicating that a process is beginning. Un-, de-; forms verbs meaning to negate, remove or separate.
snappen	Dutch (nld)	To catch in the act. To get, to understand.
ontsnappen	Dutch (nld)	To escape.

Words with the same origin as ontsnappen