present participle of come down

(set phrase, figuratively) Used as a reminder or warning regarding an impending deadline.

(idiomatic) To become known; to be revealed.

(idiomatic) To enter service or become active. / (idiomatic) To login to an Internet communication system, such as an instant messenger, online game or forum.

To pursue or follow; to pursue with hostile intent. / To follow or succeed; to be the successor of.

(idiomatic) To appear in one's thoughts.

(slang, obsolete) To exaggerate. / (slang, dated) To make oneself unpleasant, especially by sarcasm.

present participle of come forth

To move forward and into view, to emerge, to appear.

An expression of disbelief.