tidy-up
Word family
Synonym discussion
Sense: phrasal verb/1
Tidy up, clean up, straighten up, and sort out can all describe improving the state of a place or set of things, but they focus on different results. Tidy up stresses putting things back in order so the whole situation looks finished and controlled. Clean up focuses more on removing dirt, waste, or visible mess. Straighten up is more informal and usually means making a room look neat quickly, often without dealing with every detail. Sort out is broader: it can mean organising papers or objects, but it can also mean solving a confusing problem. If you put toys back in boxes before guests arrive, you tidy up; if you wash sticky plates and wipe the table, you clean up.
Etymology
Tidy-up combines tidy with the particle up. Tidy goes back to an Old English word linked to a fitting or proper time, and later developed the idea of neat order. Adding up gives the verb a sense of bringing something to completion, and the hyphenated noun grew from that phrasal verb to mean a short session of putting things back into order.