
Beg off
Polite Refusal
Used to politely decline an invitation or request without causing offense.

Thanks for the invite, but I must beg off this time.
Slightly Formal
More formal than outright saying 'no', but still casual enough for everyday use.

May I beg off assisting with the event? I'm overcommitted already.
Implies Commitment
Often suggests that you were expected to attend or participate in something.

I know I promised to help, but I'll have to beg off.
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