下工夫

to put in time and energy / to concentrate one's efforts

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

to knock off (at the end of a day's work) / to finish work

work / worker / skill / profession / trade / craft / labor

(old) laborer

period of time (may be months, or mere seconds) / spare time / skill / labor / effort

husband / man / manual worker / conscripted laborer (old)

(classical) this, that / he, she, they / (exclamatory final particle) / (initial particle, introduces an opinion)