infill

in +‎ fill

infill (third-person singular simple present infills, present participle infilling, simple past and past participle infilled)

1. To fill in a space, hole or gap.
2. To rededicate land in an urban environment to new construction.

infill (plural infills)

1. That which fills in a space, hole or gap.
2. (cosmetics) The redecoration of a fingernail or toenail after it has grown, to prevent an unsightly gap.

Apparently by shortening.

infill

1. (uncommon, especially military) Infiltration, the act of going into a place.
   • 1991, John Leppelman, Blood on the risers: an airborne soldier's thirty-five months in Vietnam:

     Hinton and I were briefed at the TOC and received maps of our AO to memorize and mark with codes for the primary and secondary LZs for infill and exfill.

   • 2011, Brett Newman, Detroit Convention Center: A Design Process and Typological Study:

     Pedestrian infill/exfill from Atwater Street

• exfill

• fill in, fill-in, fillin'