[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[Add to Longdo]
[nikopon](n) (1) backslapping; a smile and a tap on the shoulder; (2) backslapper; someone who smiles and gives you a slap on the shoulder; someone who wins people over[Add to Longdo]