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tack, tact
tack (TAK) (noun)
A small sharp nail usually with a wide, flat head: "The teacher used a tack to hang up the notice on the bulletin board."
tact (TAKT) (noun)
1. The ability to do or to say things without offending or upsetting other people: "The success of the international conference depends a great deal on the tact of the political leaders who will be trying to solve some of the economic problems that are on the table for the meeting."
2. The skills to appreciate the delicacy of a situation and to do or to say the kindest or most fitting things; diplomacy: "The boy's father used tact in dealing with their tragedy."

Tact is the knowledge of how far is too far or the skill in making a point without making an enemy.

A tactful husband told his wife, "How do you expect me to remember your birthday when you never look any older?"

People with tact have less to retract.

Tact is the ability to make a person see the lightning without letting him feel the bolt.

—O.A. Batista