Slang Expressions with the letter 'O'

source: Maple Leaf ESL    2016年4月26日
In this lesson, we look at the following slang expressions that use the letter 'O': on the same wavelength, offbeat, on fire/on a roll, (be) on to something, (be) out of one's mind, off, off/out of it, on the fly, and old school.
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