also: ノー・マーク
noun which may take the genitive case particle 'no', noun
unnoticed; off the radar; not under observation
General use for something or someone that is not being watched, noticed, or considered. Often used in competitive or strategic contexts.
wasei-eigo (Japanese-coined English), from no mark
He was off everyone's radar, but suddenly emerged as a title contender.
That issue had long gone unnoticed.
The defender ended up leaving him completely unmarked.
In the second half, he ended up completely unmarked.
The unmarked player scored the goal.
He took the shot while completely unmarked.