send regrets

See: refuse
References in periodicals archive ?
Meanwhile, I've had to send regrets to inviters and reset appointments.
Carbon footprint, C02, sheep jumpers, thank goodness I had to send regrets.
This time around, a scheduling conflict stirred speculation that hardline secularists were searching for an excuse to send regrets to the president.
Robert Thomson, editor of the (Murdoch-owned) London Times, was invited to meet Bush at the White House November 12, a week before Bush's flight to London but, so the Financial Times later reported, had to send regrets.