i wrote it before لا مؤاخذة=لا تؤاخذنى for example if you are passing through the aisle on a bus and many people are standing you'll say this word as if you are saying excuse me also if you stepped by mistake on someone's foot you'll say this word as if you are saying sorry

Neither of what you wrote in the title is correct. It is: لا مؤاخذة As fofa wrote. Also you may use it to start a conversation with someone, or to interrupt someone.

this is correct, لا مؤاخذة=لا تؤاخذنى