adj.
involving rapid inward and outward movement: smuggling drugs was a quick in-and-out operation
Oxford Dictionary
adj.
involving inward and outward movement, especially rapid entrance and exit: smuggling drugs was a quick in-and-out operation
Oxford American Dictionary
ph.
being a frequent visitor to (a house) or frequent inmate of (an institution)
Oxford Dictionary
ph.
being a frequent visitor to (a house) or frequent inmate of (an institution)
Oxford American Dictionary
ph.
continuously or repeatedly over a period of years
Oxford American Dictionary
ph.
heard but disregarded or quickly forgotten
Oxford American Dictionary
ph.
heard but quickly forgotten
Oxford Dictionary