搞通

搞通	gǎo tōng	to make sense of sth
搞	gǎo	to do / to make / to go in for / to set up / to get hold of / to take care of
通	tōng	to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc
通	tòng	classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)