One who, or that which, dips (immerses something, or itself, into a liquid).
A chocolate dipper dips the cream centers into warm chocolate by hand; when taken out the creams are shaped [...]1903, Twelfth Census of the United States, 1900, page 1189:
When the engine runs the dipper dips in the oil once in every revolution of the crankshaft and the oil is splashed on the cylinder walls.2001, Thermal Engineering, Tata McGraw-Hill Education, →ISBN, page 472:
2
Any of various small passerine birds of the genus Cinclus that live near fast-flowing streams and feed along the bottom.
3
A cup-shaped vessel with a long handle, for dipping into and ladling out liquids; a ladle or scoop.
4
India, UK The control in a vehicle that switches between high-beam and low-beam (i.e. dips the lights), especially when used to signal other vehicles.
It is doubtful if the Victorian Londoner needed any warning, for the artful mobsmen, toolers, whizzers and dippers, together with their stickman accomplices, were everywhere in the crowds, in the underground, on railway trains […]1976, Michael Harrison, Beyond Baker Street: A Sherlockian Anthology, page 117:
8
Historical A person employed in a tin plate works to coat steel plates in molten tin by dipping them.
9
Historical A person employed to assist a bather in and out of the sea.
It's either that or watch Dipper hopes of big overall seat gains dashed May 2 in Ontario.2011 April 27, David Olive, “Historic Shift to NDP Confirmed in New Poll”, in Toronto Star, archived from the original on 28 Jun 2013: