Wiktionary
vb. To attack with petty and repeated blows; to carp at; to nag; to tease.
WordNet
Usage examples of "peck at".
A moment later I had his body held firmly against my leg where he couldn't peck at me anymore.
It was only when he looked up and had a small hailstone peck at his cheek that he realized what was happening.
He wanted to open his belly and strew his old guts on the rocks for carrion birds to peck at.
Hooked claws locked into his sound shoulder as Snowcloud gripped hold and began to peck at his head with an iron-sharp beak.
Every time he saw Barbara hand in hand with that Sam Yeager, the eagle took another peck at his liver.
Only Tommy and little Colleen peck at their food and so, what with the cost of living constantly going up, things were tough.
Thereon the Zulu sprang back with a wild shout, and, avoiding the sword cuts, began to peck at his foe with his terrible axe, till in a few seconds the man's fate overtook him and he fell with a clash heavily and quite dead upon the marble floor.