any of several small brownish-grey European songbirds of the genus Sylvia (warblers), esp S. borin, common in woods and hedges: in some parts of Europe they are esteemed as a delicacy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for garden warbler
Historical Examples of garden warbler
Beccafico, a European bird (Sylvia hortensis), the garden-warbler.
The garden-warbler, too, is quite a stranger, and I have never recognised it in these parts at all.In a Cheshire Garden