expression
if not exist; if there is no; if one doesn't have
Colloquial contraction of なければ used with ある or いる to express a negative condition about existence or possession.
See also: なければ
お金がなきゃ、何も買えないよ。
If I don't have money, I can't buy anything.
時間がなきゃ、映画に行けない。
If there's no time, I can't go to the movies.
expression, auxiliary
Colloquial contraction of なければ used as a general negative conditional auxiliary after verbs, adjectives, or nouns.
See also: なければ
急がなきゃ、遅れるよ。
If we don't hurry, we'll be late.
安くなきゃ、買わない。
Unless it's cheap, I won't buy it.
I must do my homework.