通假

phonetic loan character / using one character interchangeably for phonetically related characters

used in 假掰[gei1 bai1]

fake / false / artificial / to borrow / if / suppose

vacation

variant of 假[jia3] / to borrow

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)

phonetic loan character / using one character interchangeably for phonetically related characters