preparatory to

-- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei

An attachment to a sewing machine, for turning under the edge of a piece of fabric, preparatory to stitching it down. n

insert a primer into (a gun, mine, or charge) preparatory to detonation or firing

v insert a primer into (a gun, mine, or charge) preparatory to detonation or firing v cover with a primer

about 6 a.m. n the time of maturity when power and vigor are greatest v insert a primer into (a gun, mine, or charge) preparatory to detonation or firing v cover with a primer