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
2a dialectal, England : pipit 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
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