English version

turn upon somebody/something

From Longman Dictionary of Contemporary Englishturn upon somebody/something phrasal verb formal1 ATTACKto suddenly attack someone, using physical violence or unpleasant words syn turn on2 if a situation, event, argument etc turns upon a particular thing or idea, it depends on that thing syn turn on The court case turned upon a technicality of company law. turn→ See Verb table
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Verb table
turn
Simple Form
Present
I, you, we, theyturn
he, she, itturns
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Past
I, you, he, she, it, we, theyturned
Present perfect
I, you, we, theyhave turned
he, she, ithas turned
Past perfect
I, you, he, she, it, we, theyhad turned
Future
I, you, he, she, it, we, theywill turn
Future perfect
I, you, he, she, it, we, theywill have turned
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Continuous Form
Present
Iam turning
he, she, itis turning
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you, we, theyare turning
Past
I, he, she, itwas turning
you, we, theywere turning
Present perfect
I, you, we, theyhave been turning
he, she, ithas been turning
Past perfect
I, you, he, she, it, we, theyhad been turning
Future
I, you, he, she, it, we, theywill be turning
Future perfect
I, you, he, she, it, we, theywill have been turning
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