Kia Kaha - Stay Strong
Kia Kaha is a Maori phrase meaning to “be strong, keep going”. It is often used to encourage people who are faced with a challenge or difficulty.
It also implies that the person offering the encouragement has faith in and believes the person they are encouraging has the capability to meet the challenge even if it may be tough.
In Seido karate and other styles they use the Japanese phrase “Osu!” in a similar way - with the added meaning of “have patience” as in “you will get through this, keep going”.
Personally I use “kia kaha” in the sense of: “stay strong”, “keep going”, “you can do this”, “have patience” (with yourself and with others).
Maori Dictionary: “Kia Kaha”