放長線釣大魚

use a long line to catch a big fish (idiom); a long-term plan for major returns

to put / to place / to release / to free / to let go / to let out / to set off (fireworks)

length / long / forever / always / constantly

chief / head / elder / to grow / to develop / to increase / to enhance

long term

thread / string / wire / line / CL:條|条[tiao2],股[gu3],根[gen1] / (after a number) tier (unofficial ranking of a Chinese city)

to fish with a hook and bait

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

surname Yu

fish / CL:條|条[tiao2],尾[wei3]