Meaning of 相槌を打つ相づちを打つ in Japanese

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Definition of 相槌を打つ相づちを打つ

あいづち(aizuchi) 【相槌 ·相づち ·相鎚】

(n) (ling) sounds given during a conversation to indicate comprehension; back-channeling

うつ(utsu) 【打つ】

(v5t, vt) to hit; to strike; to knock; to beat; to punch; to slap; to tap; to bang; to clap; to pound
８時をちょうど打ちましたね。
It has just struck eight, hasn't it?
to strike (noon, etc.); to sound (cymbals, etc.); to beat (a drum, etc.)
to beat (rhythmically, e.g. pulse, waves, etc.)
to move; to impress; to touch
to drive in; to hammer in; to put in; to inject
to type; to send; to transmit
to insert; to write in; to mark
to make (noodles, etc.); to prepare
to till (soil)
to sprinkle; to throw; to cast
to do; to carry out; to play; to perform; to engage in (gambling, etc.)
to pay (a deposit, etc.)
to visit (on a pilgrimage)
to line (a coat)
to bind (a criminal)

ぶつ(butsu) 【打つ】

を(wo)