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To tidy up something (or tidy something up) is to put everything in its correct place and make it tidy.

Examples of use:
1. Can I go out when I have tidied up my room?

2. I must tidy my books up. I can’t find the one I need for my studies.

infinitive – tidy up

present simple – tidy up and tidies up

-ing form – tidying up

past simple – tidied up

past participle – tidied up

See also, jumble up

Image by Barbara L. Slavin