This is the 17740th most frequent Russian word.
уйду
"I will leave."
"Уйду" is used here to describe a conditional action, where leaving work depends on a certain condition.
Если все будет нормально, я уйду с работы рано.
If everything is fine, I will leave work early.
In this example, "уйду" is part of a question-indicating construction, expressing uncertainty about leaving.
Я не знаю, уйду ли завтра.
I don't know if I will leave tomorrow.
Here, "уйду" (I will leave) is the first-person singular future tense of the verb "уйти", indicating a planned departure in the future.