Scottish National Dictionary (1700–)
CAP, v.4 Cf. Kep, v.1
1. “To seize by violence, to lay hold of what is not one's own; a word much used by children at play” (Sc. 1808 Jam.); “to take possession of anything used in play out of season” (Edb. 1910 Scotsman (3 Sept.)).
Edb. 1845 F. W. Bedford Hist. G. Heriot's Hospital (1859) 346:
It was too bad of him to cap my top and throw it up to the barty because I was playing with it a week after the time for them had passed.
2. “To stop the progress of something that is in motion; to arrest; to prevent” (Uls. 1924 (2nd ed.) W. Lutton Montiaghisms).
Hence cap-ball, “a boys' game” (Uls. 1880 W. H. Patterson Gl. Ant. and Dwn.), the same as Catchers, q.v.[Cf. O.Fr. caper, to seize, take (Godefroy), from Lat. capre, idem. Cf. also Cape and Kep, v.1 Cap = to arrest, has been obs. in Eng. since 1611 (N.E.D.).]
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"Cap v.4". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 15 Aug 2020 <https://www.dsl.ac.uk/entry/snd/cap_v4>
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