Definition of overdeepen in US English:

overdeepen

verb

Physical Geography
  • 1with object To erode (a valley) more deeply by glacial action than would occur by water erosion alone.

  • 2with object More generally: to deepen excessively or abnormally; especially to further deepen by erosion.

Origin

Early 20th century; earliest use found in Science. From over- + deepen, probably after overdeepening.

Pronunciation

overdeepen

/ˌəʊvəˈdiːp(ə)n/