Definition of by surprise:
°Something not expected.
"It was a surprise to find out I owed twice as much as I thought I did."
°Unexpected.
"The surprise attack was devastating."
°To cause (someone) to feel surprise.
"It surprises me that I owe twice as much as I thought I did."
°To do something to (a person) that they are not expecting, as a surprise.
"He doesn't know that I'm in the country - I thought I'd turn up at his house and surprise him."
Definition of by surprise:
°Something not expected.
"It was a surprise to find out I owed twice as much as I thought I did."
°Unexpected.
"The surprise attack was devastating."
°To cause (someone) to feel surprise.
"It surprises me that I owe twice as much as I thought I did."
°To do something to (a person) that they are not expecting, as a surprise.
"He doesn't know that I'm in the country - I thought I'd turn up at his house and surprise him."