弄懂弄通

to get a thorough understanding of sth (idiom)

lane / alley

to do / to manage / to handle / to play with / to fool with / to mess with / to fix / to toy with

old variant of 弄[nong4]

variant of 弄[long4]

to make sense of / to grasp the meaning of / to figure out

to understand / to comprehend

to get a good grasp of

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)