Which preposition to use with elflock

over Occurrences 1%

That is what we call 'the Oxford voice.'" "How remarkable!" said Henry, his attention called off by a being with a face that half suggested a faun, and half suggested a flower,a small, olive-skinned face crowned with purply black hair, that kept falling in an elflock over his forehead, and violet eyes set slant-wise.

Which preposition to use with  elflock