no worries

From no + plural of worry (“concern, cause for anxiety”), but used flexibly.

• Audio (General Australian):

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no worries

1. (especially UK, Canada, Australia, New Zealand, Singapore, Malaysia, colloquial) A general reassurance not to be concerned further with a subject.
   1. Be reassured that it does not bother me; I am not concerned.

      Sorry if my music's bothering you. — No worries. I really like classical.

   2. It was no problem; not at all; you're welcome (particularly, though not strictly, when the favour being acknowledged was requested or in response to a difficulty, rather than spontaneous).

      Thanks so much for the lift. — No worries, I had to go that way anyway.

   3. Do not worry, I will do it.

      I need this done by closing time. — No worries, I'll have it sorted.

Essentially an injunction not to be concerned further with the subject. It may be used as a stand-alone utterance, for example, as a response to a request, in answer to an expression of concern, or to an apology.

• not to worry, she’ll be right, no problem, no probs, no wucking furries, no wuckas, hakuna matata
• (I'll do it): consider it done

• no biggie