Where does “втискиваться” come from?

втискиваться (Russian) comes from Russian вти́скивать, from Russian вти́снуть, from Russian в-, from Old Church Slavonic въ-, from Proto-Slavic vъ(n)-, from Proto-Indo-European h₁én — in.

втискиваться (Russian): to squeeze (in, into), to squeeze oneself (in, into)

Definitions

to squeeze (in, into), to squeeze oneself (in, into)

Ancestry of “втискиваться”, step by step

Step	Language	Word	Meaning
1	Russian	вти́скивать	to squeeze (in, into), to cram (in, into)
2	Russian	вти́снуть	to squeeze (in, into), to cram (in, into)
3	Russian	в-	in, into
4	Old Church Slavonic	въ-	in, into describing an action of moving inside of something
5	Proto-Slavic	vъ(n)-	—
6	Proto-Indo-European	h₁én	in

Every word from Proto-Indo-European h₁én →Every word from Russian в- →Every word from Proto-Slavic vъ(n)- →