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Phrasal Verb Definition Example
act up behave or function improperly I think I need to take my car to the mechanic because it's acting up again.
add * up + calculate a sum I added up the receipts and it totaled $135.46.
add up to + equal an amount The total expenses added up to $325.00. 
add up make sense Her story doesn't add up. I think she is lying.
ask * out + invite on a date I can't believe that Joe finally asked me out on a date!
ask * over + invite to one's home Why don't we ask the Johnsons over for dinner?
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