## Gazump ##

> make a higher offer for a house than (someone whose offer has already been accepted by the seller) and thus succeed in acquiring the property.
>
>"the trio are fuming after they were gazumped by a property speculator"

The formal usage is as above but it also has a metaphorical usage of taking an opportunity that rightfully belongs to someone else.

## [Cutting someone’s grass][1] ##

> Getting/flirting with someone who your friend has already gotten with or 'shotgunned'.

Also, cut another’s lunch.

Specifically related to dating/sex.



  [1]: https://www.urbandictionary.com/define.php?term=cutting%20someone%27s%20grass