rocket science
Meaning: something very difficult to understand
Example: I've no idea why Kelly can't make a spreadsheet, and it's not exactly rocket science is it? Read on
hit the books
Meaning: to study very hard
Example: I have an exam tomorrow, I need to hit the books tonight. Read on
rule out
Meaning: to exclude out something
Example: Rule out each and every word from the application which you don’t want the principal to read. Read on
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