Regular verb; used both literally (nautical) and figuratively (to sabotage).
Definitions
To attack or sink (a vessel) using a submarine. Enemy forces attempted to submarine the convoy during the night.
To undermine, sabotage, or ruin (a plan, project, or reputation). Leaked emails submarined the candidate's campaign.
To move or go under the surface of water, especially stealthily. The research vessel submarined beneath the ice shelf without a sound.