-ttu

Etymology
From, from (passive infix) + an uncertain suffix, probably either  or  (compare ).

Usage notes

 * Some inflected forms have specific uses:
 * genitive singular: used with verbs of reporting or observing to refer to the action having been done by someone (passively) according to that report or observation.
 * partitive singular:
 * used (chiefly) with a possessive suffix for "having done", "after X had done"
 * used with to express finishing something, often in the sense of an achievement
 * used with without a possessive suffix to disparagingly talk about something someone has done
 * used with to express finishing something, often in the sense of an achievement
 * used with without a possessive suffix to disparagingly talk about something someone has done
 * used with without a possessive suffix to disparagingly talk about something someone has done