waning moon, last quarter moon

free time; leisure; spare time

(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.

朝飯前: A piece of cake; an extremely simple thing.

(telephony) a common Japanese telephone greeting: hello; used when answering the telephone / used to confirm that the person being addressed is listening, or to confirm if anyone is listening

put away

lurker (in an online community) (abbr. ROM, ロム)

unsuccessful

failure

completion bonus, fee paid upon success of a project, contingent fee