Expressions (phrases, clauses, etc.)
quick to take a hint; very responsive; quick on the uptake
see ツーカー
彼とはツーと言えばカーの仲だよ。以心伝心の仲とでも言っておこう。He and I have a near-telepathic understanding of each other. No sooner does one of us say something than the other is already responding.
Also written つうと言えばかあ【つうといえばかあ】