tight schedule

:  having elements close together

:  so close in structure as to prevent passage or escape (as of liquid, gas, or light) — compare lightproof, watertight

:  fitting very close to the body

:  fast, tightly, firmly

:  in a sound manner :  soundly

:  a written document

:  a statement of supplementary details appended to a legal or legislative document

:  a written or printed list, catalog, or inventory

:  to appoint, assign, or designate for a fixed time

:  to place in a schedule

:  to make a schedule of