when : Idioms & Phrases
only when
-
adverb never except when
only; only if.
- call me only if your cold gets worse
WordNet
When as , When that
- at the time that; when. Obs.
Webster 1913
when first seen
-
adverb as a first impression
at first blush.
- at first blush the offer seemed attractive
WordNet
when the time comes
-
adverb at the appropriate time
in due time; in due season; in due course; in good time.
- we'll get to this question in due course