sõidukisse
Sõidukisse is an Estonian word that translates to "into the vehicle" or "in the vehicle" when referring to the act of entering or being inside a vehicle. It is a grammatical case ending, specifically the illative case, which indicates movement into a location. The base word is "sõiduk," meaning "vehicle." Therefore, "sõidukisse" signifies movement towards or arrival within the confines of a vehicle.
This term is commonly used in everyday Estonian conversation. For instance, one might say "Lapsed läksid sõidukisse"