Similar words: even when, where, wheat, whether, then, whereas, wherein, by then. Meaning: [wen] 
adv.1. at what time or period? how long ago? how soon?: When are they to arrive? When did the Roman Empire exist? 2. under what circumstances? upon what occasion?: When is a letter of condolence in order? When did you ever see such a crowd? conj.3. at what time: to know when to be silent. 4. at the time or in the event that: when we were young; when the noise stops. 5. at any time; whenever: He is impatient when he is kept waiting. 6. upon or after which; and then: We had just fallen asleep when the bell rang. 7. while on the contrary; considering that; whereas: Why are you here when you should be in school? pron.8. what time: Till when is the store open? 9. which time: They left on Monday, since when we have heard nothing. n. 10. the time of anything: the when and the where of an act..
adv.1. at what time or period? how long ago? how soon?: When are they to arrive? When did the Roman Empire exist? 2. under what circumstances? upon what occasion?: When is a letter of condolence in order? When did you ever see such a crowd? conj.3. at what time: to know when to be silent. 4. at the time or in the event that: when we were young; when the noise stops. 5. at any time; whenever: He is impatient when he is kept waiting. 6. upon or after which; and then: We had just fallen asleep when the bell rang. 7. while on the contrary; considering that; whereas: Why are you here when you should be in school? pron.8. what time: Till when is the store open? 9. which time: They left on Monday, since when we have heard nothing. n. 10. the time of anything: the when and the where of an act.. 
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1. When the sun comes in, the doctor goes out. 
2. When love puts in, friendship is gone.
3. When wine is in truth is out.
4. When in Rome, do as the Romans do.
5. The devil is good when he is pleased.
6. A sow, when washed; returns to the muck.
7. When the fox preaches, take care of your geese.
8. When three know it, all know it.
9. Hoist your sail when the wind is fair.
10. Take time when time cometh, lest time steal away.
11. Frugality when all is spent comes too late.
12. When you are at Rome(sentencedict.com), do as Rome does.
13. I fear the Greeks, even when bringing gifts.
14. When guns speak it is too late to argue.
15. When war begins, then hell openeth.
16. He never lies but when the holly is green.
17. When you go to Rome, do as Rome does.
18. He is wise that knows when he’s well enough.
18. Sentencedict.com try its best to gather and build good sentences.
19. When a friend asks, there is no tomorrow.
20. When war begins then hell opens.
21. When the cat’s away, the mice will play.
22. Let's cross the bridge when we come to it.
23. The swan sings when death comes.
24. Don’t swap horses when crossing a stream.
25. When the fox preacheth, then beware your geese.
26. When the well is full, it will run over.
27. Take time when time comes lest time steal away.
28. When all men speak no man hears.
29. Do not swap horses when crossing a stream.
30. Death when it comes will have no denial.
More similar words: even when, where, wheat, whether, then, whereas, wherein, by then, and then, hence, elsewhere, overwhelm, now and then, kitchen, wheelchair, strengthen, overwhelming, in the name of, comprehension, to the number of, comprehensive, comprehensible, phenomenon.