depend (up)on (someone or something)

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depend (up)on (someone or something)

1. To rely on someone or something. You can depend on Tom, so if he said he'd be here at 11:30, then he'll be here at 11:30. I still haven't found a job, so, yes, I depend upon my parents for money.
2. To be dictated by certain conditions. Where we hold the wedding ceremony depends entirely on the weather—if it's rainy, then we'll have it indoors.
3. To be addicted to something. I have a harder time falling asleep these days, but at least I don't depend on sleeping pills anymore.
See also: depend
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

depend (up)on someone or something

to rely upon someone or something. (Upon is formal and less commonly used than on.) Can I depend on you to do this right? You can depend upon me for help.
See also: depend, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

depend on

or depend upon
v.
1. To be contingent upon something or someone for an outcome: Whether or not we go on the picnic depends on the weather.
2. To rely on something or someone, especially for support or maintenance: Children depend on adults for food and shelter.
3. To place trust or confidence in someone or something: You can depend upon my honesty.
4. To have a chronic or compulsive need for something; be addicted to something: As time went by, he began to depend on painkillers to get him through the day.
See also: depend, on
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in classic literature ?
If Mr Haredale wins, depend upon it, it'll be a deep one; or if he loses, it will perhaps be deeper still, for he'll never give in unless he's beaten down.
'Ah, you may depend upon it he is, or he wouldn't be so surly,' remarked Miss La Creevy, who was an odd little mixture of shrewdness and simplicity.
"Depend upon it," I said to Kate, only yesterday morning at breakfast, "that after your uncle has provided, in that most ready manner, for Nicholas, he will not leave us until he has done at least the same for you." These were my very words, as near as I remember.
The life of a soldier or commuter could depend upon it.
Whether DC-SIGN leads to new AIDS drugs or vaccines may depend upon its role in the immune system.