to be attached; to be connected with; to remain imprinted; to scar; to bear (fruit, interest, etc.); to be acquired (of a habit, ability, etc.); to increase (of strength, etc.)
Examples (4 in total)
彼と彼の兄とは見分けがつかない。
I can't tell him apart from his brother.
その双子は見分けがつかない。
The twins are indistinguishable from each other.
何年もたっているので彼女は私のことを見分けがつくかしら。
I wonder if she'll recognize me after all these years.