«يُومْ لَكْ وِيُومْ عَلِيكْ»

The saying holds that fortune never stays with one party. Good times and bad times take turns, so a day that brings gain may be followed by one that brings loss. Its two halves stand in exact parallel, with only "for you" and "against you" changing.

In practice it urges balance. The person who is succeeding should stay modest and not gloat, while the struggling person can take heart that hardship is temporary. It voices a general view of fortune's turns, not a prediction about any particular situation, and can serve as caution, consolation, or resigned remark.

Said to someone enjoying a win, as a reminder that it may not last, or to someone after a setback, as comfort that their turn will come. It also suits reflection on how circumstances can reverse, as a general observation rather than a forecast.