penetrate

[1]	enter , go/pass through/into , pierce , bore (into) , lance , spear , go through/into , probe , stab , puncture , perforate , drill
[2]	permeate , fathom , bottom , diffuse , suffuse , pervade , filter/seep through , percolate through
[3]	reach , click , get through , get to , get at , dawn , come home , touch , affect , get across , hit , strike , fall into place
[4]	infiltrate , sink in , be absorbed , be understood , register , come/get through , become clear , come across , be realized , (Colloq) soak in , seep in
[5]	understand , sense , become aware/conscious of , see (through) , gain insight (in)to , discern , uncover , discover , find (out) , comprehend , grasp , work out , unravel , fathom , perceive , (Colloq) get , figure out , dig , (Brit) suss out
[6]	interpenetrate , imbue , riddle