set (something or someone) against

phrasal verb
set (something or someone) against; setting (something or someone) against; sets (something or someone) against

Definition of set (something or someone) against

1 : to put (something) in a place or position so that it is touching (something else) He set the ladder against the wall.
2 : to cause the action of (a film, story, etc.) to happen in (a certain place or during a certain time) often used as be set against The story is set against (the backdrop of) the Second World War.
3 : to compare (something) to (something else) Let's set the advantages against the disadvantages. often used as (be) set against The fines were small when set against the company's huge annual profits.
4 British : to list (something) as an expense in order to reduce (income for which tax is due) You can set your mortgage payments against your rental income.
5 : to cause (someone) to disagree with or oppose (someone) The incident set brother against brother.

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