This is the 240th most frequent Hindi word.
गर
The Hindi word "गर" means "if" or "in case."
'अगर' is used here as a conditional word to form an "if" clause in a conditional sentence.
अगर तुम पढ़ाई करोगे, तो तुम्हें सफलता मिलेगी।
If you study, you will achieve success.
'गर' is an abbreviated form of 'अगर' and is used for the same conditional meaning, typically in spoken language for conciseness.
गर तुम्हारे पास समय हो, तो मुझे फोन करना।
If you have time, call me.
'गर' is a suffix used here in a specific idiomatic phrase ('गोरे-गर-फैशन'), representing an aspect or modification but not carrying its conditional meaning.