Does "twenty pushups" really need a separate sense? Surely it's just "twenty somethings", in a specific context. 109.154.74.120 22:31, 2 August 2010 (UTC)
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"(military) A set of twenty push-ups." This is not specific to the number; any number can be used, e.g. "give me forty". Equinox ◑ 01:07, 25 June 2018 (UTC)
Chambers 1908 also defines twenty as "an indefinite number". Perhaps it used to be something vaguer like couple or dozen? Equinox ◑ 04:34, 1 December 2018 (UTC)