Acceptance is;

A quality of presence.
No concepts, thoughts and ideas.

Yes instead of no. There is agreeing to it.

A willingness to let go. If you experience a feeling of holding on, then you must let it go.

Being completely free, of a voice that is saying you are doing it wrong.

Just to experience what is there. Just touching the moment.

To notice where there is non-acceptance.

This too. This too is ok.

If i feel it in my body i see there is anger.
And if i bring acceptance and attention to that.
I realise that it is fear. Feel it in my body, fear, fear, in my throwte
I see it is fear that i will loose something,
or someone will destroy my happyness.
And if i accept the fear and look at it, i realise it is careing.
It is love.
And then i can let it live in my body because i understand this now.

So by accepting this anger, i can move into the next understanding.
If I do not accept it, reject it, then i will just be reactionary to it.

Accept is not giving up. It is loving as is, loving without change.