grip,
hold, clutch, clasp, clench
understanding,
comprehension, knowledge, awareness, perception, sense
reach,
scope, extent, range, capacity, control
take
hold of, clutch, grab, seize, grip, clasp, snatch, grapple, clench
antonym: let
go
understand,
comprehend, get, see the point of, follow, get the picture (informal), get the
message (informal)