What is the meaning of Nach?

after, past (later in time)

after, behind (in sequence)

to, towards (with geographical names; see usage notes below)

according to; guided by

by the authority of; following

like (see usage notes below)

for

after, behind, later, next to

that...not .

not

isn’t...?/whether/if it is...

who/which isn’t...

still

yet

just

nor

after-party

some, any

Alternative spelling of nách (that (it) is not)

Alternative form of (negative particle used with the imperative) used before an infixed pronoun

Used together with the dependent form of a verb to form negative questions.

Used together with the dependent form of a verb to form negative subordinate clauses; that ... not

Source: wiktionary.org