spoken for

spoken for (not comparable)

1. (of a person) taken; unavailable; not single (compare with the obsolete: bespoken)

1. I'm sorry, I can't go on a date with you - I'm spoken for.

spoken for

1. claimed, reserved, or occupied

   I looked all over, but all the seats are already spoken for.

In this sense, speak for nearly always appears in the past participle, as given here.

• forspoken