ча́сом

very rarely used (#57003)

1.
by any chance, by chance, perchance
Ты ча́сом не зна́ешь, где он?
Do you happen to know where he is?
Colloquial; mostly in questions with «не».
2.
by an hour, an hour (earlier/later)
Он пришёл ча́сом раньше.
He came an hour earlier.
Instrumental of «час», with comparatives such as «раньше», «позже».
3.
(rare) sometimes, at times, now and then
Ча́сом он захо́дит к нам вечером.
Now and then he drops by in the evening.
Colloquial or regional.