[あう(P);おう(ik), au (P); ou (ik)] (v5u, vi) (1) to come together; to merge; to unite; to meet; (2) to fit; to match; to suit; to agree with; to be correct; (3) to be profitable; to be equitable; (suf, v5u) (4) (after the -masu stem of a verb) to do ... to each other; to do ... together; (P)#7838
[かさなる, kasanaru] (v5r, vi) (1) to be piled up; to lie on top of one another; (2) to come one after another; to happen over and over; to pile up (e.g. stress); to accumulate; (3) to overlap (each other); to occur at the same time; to happen simultaneously; (P)#15948
[すりあわせ, suriawase] (n) (1) precision surface finishing; lapping; (2) bouncing of ideas (opinions, etc.) off each other to obtain a fine-tuned integrated whole