on

/ɔn/, /ɑn/ prep, adv [not gradable] (SUPPORTED BY)

Definition

› supported by or resting at the top of another thing: There is snow on the ground. You put pudding in the pie crust and then put whipped cream on.

(Definition of on prep, adv (SUPPORTED BY) from the Cambridge Academic Content Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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