1. (Aus.) a shock, a disappointment.
|Sun. Times (Perth) 6 Mar. 8/3: That it should have been Ivy Lawson charged with such a dirty low-down trick [...] is a bit of a knock-over.|
2. (US Und.) a police raid.
|Argot: Dict. of Und. Sl.|
3. (US police) an armed robbery.
|Story Omnibus (1966) 293: He started peddling these pamphlets the day before the knockover.‘The Big Knockover’|
|High Sierra in Four Novels (1984) 290: This is a soft spot. They’ve never had a knock-over in Tropico Springs.|
|Tell Them Nothing (1956) 75: You told us it was an easy knockover.‘Cool Cat’ in|
4. (Aus.) a substantial, if surprising, success.
|I Travelled a Lonely Land (1957) 235/1: knock-over – an outstanding success.|
5. (US) an easy task.
|Blue Collar 50: ‘Is it a knockover or not?’ ‘It’s a knockover all right. Baby food.’ [HDAS].|