三天两头

lit. twice every three days (idiom); practically every day / frequently

three / 3

day / sky / heaven

two / both / some / a few / tael, unit of weight equal to 50 grams (modern) or 1⁄16 of a catty 斤[jin1] (old)

both ends / both parties to a deal

head / hair style / the top / end / beginning or end / a stub / remnant / chief / boss / side / aspect / first / leading / classifier for pigs or livestock / CL:個|个[ge4]

suffix for nouns