Definition of plough-in in US English:

plough-in

(US plow-in)

noun

Nautical
  • The uncontrolled downward pitching of a hovercraft, usually caused by part of the leading edge of the skirt touching the water when the craft is moving at speed, often resulting in a capsize; an instance of this.

Origin

1960s; earliest use found in The Times. From plough + in.

Pronunciation

plough-in

/ˈplaʊɪn/