Latin language speakers may immediately translate this as flu, from la gripe in Spanish and la grippe in French. Well, it is actually something of a false friend. There is a medical meaning for this word in English (pronounced graip by the way). It refers to sharp gastric or intestinal pains, something that babies and young children apparently suffer a lot from.
When you are more likely to come across gripe is when someone is complaining about something. It is a synonym for moan when a moan means to complain but it does not refer directly to the type of sound. Nevertheless, you can imagine the tone of complaint.
The neighbour is having another gripe about the lack of rubbish collection.
Stop griping about your teachers and just get down to your homework.
Felix is really not ideal company at a party. He’s always pulling talk around to his gripes and moans about life.