Meaning : Being precise with regard to a prescribed or specified criterion.
Example :
His guess was on the nose.
The prediction for snow was right on the button.
Synonyms : on the nose
Meaning : Just as it should be.
Example :
`Precisely, my lord,' he said.
Synonyms : exactly, on the dot, on the nose, precisely
On the button ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Marathi. On the button ka matlab kya hota hai?