To pick at food is to eat only a little of it. Also, to keep touching something that should be left alone.
The eating sense signals loss of appetite or unhappiness, and somebody picking at a plate is usually worrying about something else. The touching sense covers scabs, threads and paintwork, and picking at a scab is the standard warning about making something worse. There is a third sense about criticism, since picking at somebody's work means finding small faults in it repeatedly.
Practised in A Man Called Ove, A Song of Ice and Fire
First appears in chapter 16 of A Man Called Ove.
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