to fill in: The old stream beds have been infilled with sediment.
the planned conversion of empty lots, underused or rundown buildings, and other available space in densely built-up urban and suburban areas for use as sites for commercial buildings and housing, frequently as an alternative to overdevelopment of rural areas.
of, relating to, or involving the use of infill in urban planning: infill condominium projects; infill office buildings and retail space.
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British Dictionary definitions for infill
the act of filling or closing gaps, etc, in something, such as a row of buildings
material used to fill a cavity, gap, hole, etc
an acrylic gel application that fills in the gap between a false nail and the root of the real nail, which is created as the real nail grows
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012