How do you say wasting time in japanese?

The Japanese phrase for "wasting time" is 時間の無駄使い (jikan no muda dukai). It is a compound noun made up of the following parts:

時間 (jikan) = time

の (no) = possessive particle

無駄 (muda) = waste

使い (tsukai) = use

The verb for "to waste time" is 時間を無駄にする (jikan wo muda ni suru).