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
