What is "unlooses"

Usage examples of "unlooses".

She puts me in my bed, unlooses the curtains—now the night might be any night, any at all.

He unlooses and dumps it, returns for the case, puts in the stones and shingle, humps the case to the body, adds a loose half-brick, ties the body to the case and pushes both of them far enough along the footbridge to topple them into the weir.