STRESS (a syllable) （音節に）強勢、アクセントをつける

To stress (verb) a word or syllable is to say it more loudly.

The noun form is also stress.
動詞の stress は、単語や音節をより強く言うこと、つまり、強勢、アクセントをつける、という意味です。

名詞形も stress で、強勢、アクセント、という意味です。

STRESS (a syllable)

You should stress the second syllable in the word “advance.” (= ad-VANCE)
The meaning of a sentence can change a lot depending on which words are stressed.
When “present” is a noun, the first syllable is stressed, but when it's a verb, the stress is on the second syllable.
STUDENT: Where should I put the stress in the word “accidentally”?
TEACHER: The main stress is on the third syllable, and the secondary stress is on the first.

英会話レッスン Take it easy!