Expression: Tout à l'heure
Pronunciation: [too tah leur]
Meanings: a moment ago, just now; in a moment, right away
Literal translation: all at the time
Notes: The French expression tout à l'heure refers to a short period of time, but has two opposite meanings: it can refer to a moment in the recent past or in the near future.
Je l'ai vu tout à l'heure.
I just saw him a moment ago.
Je vais le voir tout à l'heure.
I'm going to see him in a moment.
À tout à l'heure ! (Informal synonym: À tout !)
See you soon!
à l'instant - a moment ago, just now
This expression can only refer to something in the past.
tout de suite - immediately, right away
Near homophonous expression: à toute allure - at top speed, full tilt
A native French speaker would never confuse à tout à l'heure and à toute allure, as the vowel sounds [œ] (in heure) and [y] (in allure) are very distinct for them, but for a French student with somewhat shaky pronunciation the sounds are close enough that they might easily be mixed up. (IPA symbols)