What is the meaning of дали?

whether, if

indefinite plural past active aorist participle of дам (dam)

near

if, whether

An interrogative particle for yes-or-no questions.

inflection of даль (dalʹ):

1. genitive/dative/prepositional singular
2. nominative/accusative plural

genitive/dative/prepositional singular

nominative/accusative plural

locative singular of даль (dalʹ)

plural past indicative perfective of дать (datʹ)

plural past perfective of да́ти (dáty)

Source: wiktionary.org