hide or hair
hide or hair or hide nor hair {n. phr.}, {informal}
A sign or trace of someone that is gone or lost; any sign at all of something missing. Usually used in negative or interrogative sentence.
Tommy left the house this morning and I haven't seen hide or hair of him since.
A button fell off my coat and I could find neither hide nor hair of it.
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Source: A Dictionary of American Idioms
