We've found 4 phrases for in use (0.147 seconds):

installed base »    The number of units of a system or product that are currently in use.

parking lot »    An open area, generally paved, where automobiles may be left when not in use.

stand the test of time »    To remain useful or valued over a long period of time; to last a long time.

toss-up »    The toss of a coin used to decide some issue.

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