Situated under one's foot or feet. / In the way; placed so as to obstruct or hinder. / Downtrodden; abject.

present participle of gudgeon

At an automatic half-barrier level crossing, a lifting barrier that does not block the whole road when in the horizontal position, placed on the left side in the UK according to driving on the left...

Any four-stroke cycle, such as the Otto cycle, for an internal combustion engine.