belling

[From Bell to bellow.]
A bellowing, as of a deer in rutting time. Johnson.

In pier, caisson, or pile construction enlarging the base of a foundation element to increase its bearing area at the bearing stratum.

The noun has one meaning:

Meaning #1: a noisy mock serenade (made by banging pans and kettles) to a newly married couple
  Synonyms: shivaree, chivaree, charivari, callithump, callathump