This is the 440th most frequent Hindi word.
तब
"तब" means "then" in English.
Here, 'तब' is used to refer to a specific moment in the past when the realization occurred.
तब हमें समझ आया कि हमने गलती की थी।
Then we realized that we had made a mistake.
In this instance, 'तब' refers to a specific past time correlated with the speaker's need.
तब तुम कहा थे जब मुझे तुम्हारी ज़रूरत थी?
Where were you when I needed you?
In this sentence, 'तब तक' refers to a specific point in time until which something is expected to occur.