In parliamentary procedure, the motion to postpone indefinitely is a subsidiary motion used to kill a main motion without taking a direct vote on it. This motion does not actually "postpone" it.

What does it mean when someone says indefinitely?

(ɪndɛfɪnɪtli ) adverb [ADV with v] If a situation will continue indefinitely, it will continue forever or until someone decides to change it or end it. The visit has now been postponed indefinitely.

What is the difference between postpone definitely and postpone indefinitely?

Under Demeter's Manual, if a motion to postpone definitely specifies a time that falls after the next regular meeting, or after a certain event which will not occur until after the next regular meeting, then it is treated as a motion to postpone indefinitely, which effectively ends consideration of the pending question ...