tiiviimmälle
tiiviimmälle is a Finnish word. It is the allative plural form of the adjective tiivis. Tiivis translates to concepts like dense, compact, concise, or airtight in English. The allative case in Finnish indicates movement towards or into something, or a state of being directed towards. Therefore, tiiviimmälle literally means "to a more dense/compact/concise/airtight state" or "towards a more dense/compact/concise/airtight state".
The usage of tiiviimmälle depends heavily on the context. If discussing physical objects, it would refer to