sixties, the numbers, years, degrees, or the like, from 60 through 69, as in referring to numbered streets, indicating the years of a lifetime or of a century, or noting degrees of temperature:
Her grandfather is in his late sixties. The temperature is in the low sixties.
adjective
5.
amounting to 60 in number.
Idioms
6.
like sixty, Informal. with great speed, ease, energy, or zest:
Everyone was working like sixty to finish up before the holidays.
Origin
before 900;Middle English (adj. and noun), Old Englishsixtig (adj.); cognate with Dutchzestig,Germansechzig,Old Norsesextigir. See six, -ty1
British Dictionary definitions for like sixty
sixty
/ˈsɪkstɪ/
noun (pl) -ties
1.
the cardinal number that is the product of ten and six See also number (sense 1)
2.
a numeral, 60, LX, etc, representing sixty
3.
something represented by, representing, or consisting of 60 units
determiner
4.
amounting to sixty: sixty soldiers
(as pronoun): sixty are dead
Word Origin
Old English sixtig
Word Origin and History for like sixty
sixty
Old English sixtig, from siex (see six) + -tig (see -ty (1)). Cf. Old Norse sextugr, sextögr, sextigir, Old Frisian sextich, Middle Dutch sestig, Dutch zestig, Old High German sehszug, German sechzig. Phrase sixty-four dollar question is 1942, from radio quiz show where that was the top prize.