Definition of mud lark
1
:a person who grubs in mud (as in search of stray bits of coal, iron, rope);
specifically
:an urchin who grubs for a living along the tide flats of the English Thames
b
:any of various birds (as the meadowlark or the shoveler) that live in moist places
c
:the Australian magpie lark (Grallina cyanoleuca) that makes mud nests
