One who, or that which, bolsters.
One who undertakes or commits to doing something.
A contractor for the royal revenue in England, one of those who undertook to manage the House of Commons for the king in the Addled Parliament of 1614.
A person receiving land in Ireland during the Elizabethan era, so named because they gave an undertaking to abide by several conditions regarding marriage, to be loyal to the crown, and to use English as their spoken language.
A funeral director; someone whose business is to manage funerals, burials and cremations.