This is the 1332nd most frequent Russian word.
уж
"Uж" in Russian can mean: 1. A grass snake (Natrix genus). 2. Intensifier in expressions (e.g., "уж точно" - "surely"). 3. Used for emphasis (e.g., "уж как есть" - "just as it is").
Here, 'уж' serves to add emotional reinforcement to the speaker's statement, conveying a sense of relief or surprise.
Я уж думал, что опоздаю, но успел.
I really thought I would be late, but I made it on time.
In this context, 'уж' provides a sense of urgency or insistence regarding the request.
Ты уж постарайся завершить работу к вечеру.
Make sure to complete the work by evening.
In this sentence, 'уж' is used to emphasize a preference or decision that is considered the most reasonable or advantageous.