ack emma n.
a.m.; in ext. use, the morning.
|Carrying On 135: He [i.e. the signaller] salutes the rosy dawn as ‘Ak Emma,’ and eventide as ‘Pip Emma.’.|
|‘Over There’ with the Australians 234: Lying snugly in a car wrapped in many blankets, and only disturbed by [...] the nurse rousing me at six ‘ack emma’ (A. M.) to have my face and hands washed.|
|in Le Slang.|
|A Rope of Sand (1947) 127: You haven’t watched bushes at two and three ack emma.|
|Mating Season 35: Wading in the Trafalgar Square fountain at five ack emma this morning.|
|I’m a Jack, All Right 21: Get yourselves back here on the dot of eight ack emma on the seventeenth.|
|Guardian Office 16 Dec. 8: Referring to [...] times as Ack Emma and Pip Emma (am and pm).|