There are "stress marks" under "Phrasal Verbs" in the Apple iPad version Oxford Advanced Learner's Dictionary. I don't find these marks in the Windows PC version of this dictionary.
There are "stress marks" under "Phrasal Verbs" in the Apple iPad version Oxford Advanced Learner's Dictionary. I don't find these marks in the Windows PC version of this dictionary.
The higher one marks the main stress in a word. The lower one is the secondary (slightly weaker) stress in a longer word. Both go before the stressed syllable.
For example, international: /ˌɪntəˈnæʃənəl/
For most purposes, you probably never need to worry about the secondary stress.