to mark or divide (something written) with punctuation marks in order to make the meaning clear.

to interrupt at intervals

Cheers punctuated the mayor's speech.

to give emphasis or force to; emphasize; underline.

to insert or use marks of punctuation.

verb

accent , accentuate , break , divide , emphasize , interject , interrupt , intersect , intersperse , mark , pepper * , point , point up * , separate , sprinkle , stress , underline