Breakdown of Что он сказал насчёт дедлайна?
он
he / it (for a masculine noun) / it (for a neuter noun)
что
what
сказать
to tell, to say
насчёт
regarding, about
Questions & Answers about Что он сказал насчёт дедлайна?
What is the difference between using насчёт here instead of о (о дедлайне)?
While о is the most neutral way to say about, насчёт translates closer to regarding or concerning. It focuses specifically on the matter at hand and is very common in business, academic, or administrative contexts, though it is perfectly natural in everyday speech too.
Why is дедлайна ending in -а here?
The preposition насчёт always requires the Genitive case. Since дедлайн is a regular masculine noun ending in a consonant, it takes the standard Genitive ending -а.
Is дедлайн standard Russian vocabulary now, or is it just slang?
It is a direct borrowing from English that has become standard corporate and academic vocabulary in Russian. It is treated as a normal inanimate masculine noun and declines fully, just like телефон or журнал. You will hear it constantly in professional environments.
I have seen на счёт written as two words before. Why is it one word here?
When used as a preposition meaning regarding or about, насчёт is always written as a single word. If you see it written as two words (на счёт), it literally means onto the account, such as transferring money на счёт (into a bank account).