running in
Word Rarity
Common
Frequency: Zipf frequency 5.23 in modern English
10
Scrabble Score
9
Letters
2
Syllables
5
Unique Chars
Meaning
noun
The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established.
Uncountable
Example Sentences
- "For years past Pacific locomotives of all classes have worked between Kings Cross and Cambridge, […] both in order usefully to fill in gaps in their long-distance rosters, and also for running-in purposes after overhaul. Before the war the 7.18 a.m. slow from Kings Cross to Cambridge was a regular running-in turn for express locomotives stationed at Kings Cross shed."
- "[...] moreover, there are times of pressure when, to expedite deliveries, cars may be driven in what should otherwise be the running-in period at speeds that do them no good - and over long distances too."