нареч.
1) ( уместно )
to the point (or purpose), apropos, appositely
2) ( своевременно )
opportune(ly), in the nick of time
besides, too, as well
3) ( вводное слово )
by the way, incidentally
4) ( заодно )
besides, too, as well
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быть кстати — come in handy
кстати и некстати — in (season) and out of season, whether appropriately or not